thinkingmachines/inkling on Rust Quick Ten

Turn #1Raw score: 1

102 in993 out883 reasoning1,095 total7.2s

user

Write Rust for the 2024 edition on stable, using only the standard library. Answer with one ```rust code block that defines what the question describes. Do not include fn main, tests, examples, explanations, or print statements.

Write is_palindrome(s: &str) -> bool. Consider only ASCII letters and digits, ignoring ASCII case and every other character. A string with none of those characters is a palindrome.

assistant

pub fn is_palindrome(s: &str) -> bool {
    let f: Vec<u8> = s.bytes()
        .filter(|&b| b.is_ascii_alphanumeric())
        .map(|b| b.to_ascii_lowercase())
        .collect();
    let n = f.len();
    for i in 0..n / 2 {
        if f[i] != f[n - 1 - i] {
            return false;
        }
    }
    true
}

Turn #2Raw score: 1

102 in3,356 out3,137 reasoning3,458 total37.5s

user

Write Rust for the 2024 edition on stable, using only the standard library. Answer with one ```rust code block that defines what the question describes. Do not include fn main, tests, examples, explanations, or print statements.

Write is_palindrome(s: &str) -> bool. Consider only ASCII letters and digits, ignoring ASCII case and every other character. A string with none of those characters is a palindrome.

assistant

fn is_palindrome(s: &str) -> bool {
    let b = s.as_bytes();
    let mut left = 0;
    let mut right = b.len().saturating_sub(1);
    loop {
        if left >= right {
            break true;
        }
        while left < right && !b[left].is_ascii_alphanumeric() {
            left += 1;
        }
        while left < right && !b[right].is_ascii_alphanumeric() {
            right -= 1;
        }
        if left >= right {
            break true;
        }
        let l = b[left];
        let r = b[right];
        let l_norm = if l.is_ascii_uppercase() { l.to_ascii_lowercase() } else { l };
        let r_norm = if r.is_ascii_uppercase() { r.to_ascii_lowercase() } else { r };
        if l_norm != r_norm {
            return false;
        }
        left += 1;
        right -= 1;
    }
}

Turn #3Raw score: 1

102 in926 out831 reasoning1,028 total6.8s

user

Write Rust for the 2024 edition on stable, using only the standard library. Answer with one ```rust code block that defines what the question describes. Do not include fn main, tests, examples, explanations, or print statements.

Write is_palindrome(s: &str) -> bool. Consider only ASCII letters and digits, ignoring ASCII case and every other character. A string with none of those characters is a palindrome.

assistant

fn is_palindrome(s: &str) -> bool {
    let v: Vec<u8> = s.bytes()
        .filter(|&b| b.is_ascii_alphanumeric())
        .map(|b| b.to_ascii_lowercase())
        .collect();
    let n = v.len();
    v[..n / 2].iter().eq(v[n - n / 2..].iter().rev())
}

Turn #4Raw score: 1

114 in312 out227 reasoning426 total2.6s

user

Write Rust for the 2024 edition on stable, using only the standard library. Answer with one ```rust code block that defines what the question describes. Do not include fn main, tests, examples, explanations, or print statements.

Write word_count(text: &str) -> HashMap<String, usize>, importing HashMap yourself. Words are separated by any whitespace and compared in lowercase, and the map's keys are lowercase. Punctuation is part of a word.

assistant

use std::collections::HashMap;

pub fn word_count(text: &str) -> HashMap<String, usize> {
    let mut counts = HashMap::new();
    for word in text.split_whitespace() {
        let key = word.to_lowercase();
        *counts.entry(key).or_insert(0) += 1;
    }
    counts
}

Turn #5Raw score: 1

114 in315 out230 reasoning429 total2.4s

user

Write Rust for the 2024 edition on stable, using only the standard library. Answer with one ```rust code block that defines what the question describes. Do not include fn main, tests, examples, explanations, or print statements.

Write word_count(text: &str) -> HashMap<String, usize>, importing HashMap yourself. Words are separated by any whitespace and compared in lowercase, and the map's keys are lowercase. Punctuation is part of a word.

assistant

use std::collections::HashMap;

pub fn word_count(text: &str) -> HashMap<String, usize> {
    let mut counts = HashMap::new();
    for word in text.split_whitespace() {
        let key = word.to_lowercase();
        *counts.entry(key).or_insert(0) += 1;
    }
    counts
}

Turn #6Raw score: 1

114 in303 out219 reasoning417 total2.5s

user

Write Rust for the 2024 edition on stable, using only the standard library. Answer with one ```rust code block that defines what the question describes. Do not include fn main, tests, examples, explanations, or print statements.

Write word_count(text: &str) -> HashMap<String, usize>, importing HashMap yourself. Words are separated by any whitespace and compared in lowercase, and the map's keys are lowercase. Punctuation is part of a word.

assistant

use std::collections::HashMap;

fn word_count(text: &str) -> HashMap<String, usize> {
    let mut map = HashMap::new();
    for word in text.split_whitespace() {
        let key = word.to_lowercase();
        *map.entry(key).or_insert(0) += 1;
    }
    map
}

Turn #7Raw score: 1

109 in211 out156 reasoning320 total1.8s

user

Write Rust for the 2024 edition on stable, using only the standard library. Answer with one ```rust code block that defines what the question describes. Do not include fn main, tests, examples, explanations, or print statements.

Write longest, which takes two string slices and returns the longer one by str::len without allocating. On a tie, it returns the first. Its result must be usable as long as both inputs are alive.

assistant

fn longest<'a>(x: &'a str, y: &'a str) -> &'a str {
    if x.len() >= y.len() {
        x
    } else {
        y
    }
}

Turn #8Raw score: 1

109 in253 out198 reasoning362 total1.9s

user

Write Rust for the 2024 edition on stable, using only the standard library. Answer with one ```rust code block that defines what the question describes. Do not include fn main, tests, examples, explanations, or print statements.

Write longest, which takes two string slices and returns the longer one by str::len without allocating. On a tie, it returns the first. Its result must be usable as long as both inputs are alive.

assistant

fn longest<'a>(x: &'a str, y: &'a str) -> &'a str {
    if x.len() >= y.len() {
        x
    } else {
        y
    }
}

Turn #9Raw score: 1

109 in861 out806 reasoning970 total9.3s

user

Write Rust for the 2024 edition on stable, using only the standard library. Answer with one ```rust code block that defines what the question describes. Do not include fn main, tests, examples, explanations, or print statements.

Write longest, which takes two string slices and returns the longer one by str::len without allocating. On a tie, it returns the first. Its result must be usable as long as both inputs are alive.

assistant

fn longest<'a>(x: &'a str, y: &'a str) -> &'a str {
    if x.len() >= y.len() {
        x
    } else {
        y
    }
}

Turn #10Raw score: 1

169 in489 out399 reasoning658 total5.4s

user

Write Rust for the 2024 edition on stable, using only the standard library. Answer with one ```rust code block that defines what the question describes. Do not include fn main, tests, examples, explanations, or print statements.

Write parse_pair<T: FromStr>(s: &str, sep: char) -> Option<(T, T)>, importing FromStr yourself. Split s at the first occurrence of sep and parse both sides as T. Return None if sep does not occur or if either side fails to parse. sep may be any Unicode character. parse_pair::<u32>("400x600", 'x') returns Some((400, 600)).

assistant

use std::str::FromStr;

pub fn parse_pair<T: FromStr>(s: &str, sep: char) -> Option<(T, T)> {
    let (left, right) = s.split_once(sep)?;
    let a = left.parse::<T>().ok()?;
    let b = right.parse::<T>().ok()?;
    Some((a, b))
}

Turn #11Raw score: 1

169 in409 out324 reasoning578 total3.5s

user

Write Rust for the 2024 edition on stable, using only the standard library. Answer with one ```rust code block that defines what the question describes. Do not include fn main, tests, examples, explanations, or print statements.

Write parse_pair<T: FromStr>(s: &str, sep: char) -> Option<(T, T)>, importing FromStr yourself. Split s at the first occurrence of sep and parse both sides as T. Return None if sep does not occur or if either side fails to parse. sep may be any Unicode character. parse_pair::<u32>("400x600", 'x') returns Some((400, 600)).

assistant

use std::str::FromStr;

fn parse_pair<T: FromStr>(s: &str, sep: char) -> Option<(T, T)> {
    let (left, right) = s.split_once(sep)?;
    let left = left.parse().ok()?;
    let right = right.parse().ok()?;
    Some((left, right))
}

Turn #12Raw score: 1

169 in325 out252 reasoning494 total2.5s

user

Write Rust for the 2024 edition on stable, using only the standard library. Answer with one ```rust code block that defines what the question describes. Do not include fn main, tests, examples, explanations, or print statements.

Write parse_pair<T: FromStr>(s: &str, sep: char) -> Option<(T, T)>, importing FromStr yourself. Split s at the first occurrence of sep and parse both sides as T. Return None if sep does not occur or if either side fails to parse. sep may be any Unicode character. parse_pair::<u32>("400x600", 'x') returns Some((400, 600)).

assistant

use std::str::FromStr;

fn parse_pair<T: FromStr>(s: &str, sep: char) -> Option<(T, T)> {
    let (a, b) = s.split_once(sep)?;
    Some((a.parse().ok()?, b.parse().ok()?))
}

Turn #13Raw score: 1

130 in906 out836 reasoning1,036 total9.7s

user

Write Rust for the 2024 edition on stable, using only the standard library. Answer with one ```rust code block that defines what the question describes. Do not include fn main, tests, examples, explanations, or print statements.

Write compose(f, g), generic over the argument and result types. f and g are closures implementing Fn. It returns a closure implementing Fn that maps x to g(f(x)), and the returned closure must be usable after the function that called compose has returned.

assistant

pub fn compose<F, G, A, B, C>(f: F, g: G) -> impl Fn(A) -> C
where
    F: Fn(A) -> B,
    G: Fn(B) -> C,
{
    move |x| g(f(x))
}

Turn #14Raw score: 1

130 in872 out800 reasoning1,002 total6.0s

user

Write Rust for the 2024 edition on stable, using only the standard library. Answer with one ```rust code block that defines what the question describes. Do not include fn main, tests, examples, explanations, or print statements.

Write compose(f, g), generic over the argument and result types. f and g are closures implementing Fn. It returns a closure implementing Fn that maps x to g(f(x)), and the returned closure must be usable after the function that called compose has returned.

assistant

pub fn compose<A, B, C, F, G>(f: F, g: G) -> impl Fn(A) -> C
where
    F: Fn(A) -> B,
    G: Fn(B) -> C,
{
    move |x: A| g(f(x))
}

Turn #15Raw score: 1

130 in670 out598 reasoning128 cached800 total4.7s

user

Write Rust for the 2024 edition on stable, using only the standard library. Answer with one ```rust code block that defines what the question describes. Do not include fn main, tests, examples, explanations, or print statements.

Write compose(f, g), generic over the argument and result types. f and g are closures implementing Fn. It returns a closure implementing Fn that maps x to g(f(x)), and the returned closure must be usable after the function that called compose has returned.

assistant

pub fn compose<F, G, A, B, C>(f: F, g: G) -> impl Fn(A) -> C
where
    F: Fn(A) -> B,
    G: Fn(B) -> C,
{
    move |x: A| g(f(x))
}

Turn #16Raw score: 1

143 in10,276 out10,056 reasoning10,419 total88.2s

user

Write Rust for the 2024 edition on stable, using only the standard library. Answer with one ```rust code block that defines what the question describes. Do not include fn main, tests, examples, explanations, or print statements.

Define Fib, with a constructor Fib::new(), and implement Iterator<Item = u64> for it. It yields the Fibonacci numbers 0, 1, 1, 2, 3, 5, and so on. It yields every Fibonacci number that fits in a u64, then None from then on. Tests run with overflow checks on.

assistant

use std::mem;

pub struct Fib {
    state: State,
}

enum State {
    Normal(u64, u64),
    Last(u64),
    Done,
}

impl Fib {
    pub fn new() -> Self {
        Fib {
            state: State::Normal(0, 1),
        }
    }
}

impl Iterator for Fib {
    type Item = u64;

    fn next(&mut self) -> Option<u64> {
        match mem::replace(&mut self.state, State::Done) {
            State::Done => {
                self.state = State::Done;
                None
            }
            State::Last(a) => {
                self.state = State::Done;
                Some(a)
            }
            State::Normal(a, b) => {
                let val = a;
                match b.checked_add(a) {
                    Some(c) => self.state = State::Normal(b, c),
                    None => self.state = State::Last(b),
                }
                Some(val)
            }
        }
    }
}

Turn #17Raw score: 0

143 in1,903 out1,744 reasoning2,046 total12.2s

user

Write Rust for the 2024 edition on stable, using only the standard library. Answer with one ```rust code block that defines what the question describes. Do not include fn main, tests, examples, explanations, or print statements.

Define Fib, with a constructor Fib::new(), and implement Iterator<Item = u64> for it. It yields the Fibonacci numbers 0, 1, 1, 2, 3, 5, and so on. It yields every Fibonacci number that fits in a u64, then None from then on. Tests run with overflow checks on.

assistant

pub struct Fib {
    a: u64,
    b: u64,
    done: bool,
}

impl Fib {
    pub fn new() -> Self {
        Fib { a: 0, b: 1, done: false }
    }
}

impl Iterator for Fib {
    type Item = u64;

    fn next(&mut self) -> Option<Self::Item> {
        if self.done {
            return None;
        }
        let current = self.a;
        match self.a.checked_add(self.b) {
            Some(next) => {
                self.a = self.b;
                self.b = next;
            }
            None => {
                self.done = true;
            }
        }
        Some(current)
    }
}

Turn #18Raw score: 1

143 in8,174 out7,973 reasoning8,317 total80.5s

user

Write Rust for the 2024 edition on stable, using only the standard library. Answer with one ```rust code block that defines what the question describes. Do not include fn main, tests, examples, explanations, or print statements.

Define Fib, with a constructor Fib::new(), and implement Iterator<Item = u64> for it. It yields the Fibonacci numbers 0, 1, 1, 2, 3, 5, and so on. It yields every Fibonacci number that fits in a u64, then None from then on. Tests run with overflow checks on.

assistant

pub struct Fib {
    state: FibState,
}

enum FibState {
    Normal(u64, u64),
    Final(u64),
    Done,
}

impl Fib {
    pub fn new() -> Self {
        Fib { state: FibState::Normal(0, 1) }
    }
}

impl Iterator for Fib {
    type Item = u64;

    fn next(&mut self) -> Option<Self::Item> {
        match self.state {
            FibState::Done => None,
            FibState::Final(v) => {
                self.state = FibState::Done;
                Some(v)
            }
            FibState::Normal(a, b) => {
                let v = a;
                match a.checked_add(b) {
                    Some(s) => self.state = FibState::Normal(b, s),
                    None => self.state = FibState::Final(b),
                }
                Some(v)
            }
        }
    }
}

Turn #19Raw score: 1

246 in3,442 out3,050 reasoning3,688 total31.8s

user

Write Rust for the 2024 edition on stable, using only the standard library. Answer with one ```rust code block that defines what the question describes. Do not include fn main, tests, examples, explanations, or print statements.

Define enum TempError deriving Debug, with the variants Empty, BadUnit(char), and BadNumber(std::num::ParseFloatError), and write parse_temp(s: &str) -> Result<f64, TempError>. The input is a number followed by one unit character, C or F, and the result is in Celsius, so "212F" returns 100.0. An empty string gives Empty. If the last character is neither C nor F, it gives BadUnit with that character, which may be non-ASCII. A number that does not parse gives BadNumber. Implement Display and std::error::Error for TempError, with source() returning the parse error for BadNumber, and implement From<std::num::ParseFloatError> for it.

assistant

use std::fmt;

#[derive(Debug)]
pub enum TempError {
    Empty,
    BadUnit(char),
    BadNumber(std::num::ParseFloatError),
}

impl fmt::Display for TempError {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match self {
            TempError::Empty => f.write_str("empty temperature string"),
            TempError::BadUnit(c) => write!(f, "bad unit: {}", c),
            TempError::BadNumber(e) => write!(f, "bad number: {}", e),
        }
    }
}

impl std::error::Error for TempError {
    fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
        match self {
            TempError::BadNumber(e) => Some(e),
            _ => None,
        }
    }
}

impl From<std::num::ParseFloatError> for TempError {
    fn from(err: std::num::ParseFloatError) -> Self {
        TempError::BadNumber(err)
    }
}

pub fn parse_temp(s: &str) -> Result<f64, TempError> {
    if s.is_empty() {
        return Err(TempError::Empty);
    }
    let unit_char = s.chars().last().unwrap();
    if unit_char != 'C' && unit_char != 'F' {
        return Err(TempError::BadUnit(unit_char));
    }
    let split_pos = s.len() - unit_char.len_utf8();
    let num_str = &s[..split_pos];
    let value: f64 = num_str.parse()?;
    if unit_char == 'F' {
        Ok((value - 32.0) * 5.0 / 9.0)
    } else {
        Ok(value)
    }
}

Turn #20Raw score: 1

246 in1,771 out1,406 reasoning2,017 total11.4s

user

Write Rust for the 2024 edition on stable, using only the standard library. Answer with one ```rust code block that defines what the question describes. Do not include fn main, tests, examples, explanations, or print statements.

Define enum TempError deriving Debug, with the variants Empty, BadUnit(char), and BadNumber(std::num::ParseFloatError), and write parse_temp(s: &str) -> Result<f64, TempError>. The input is a number followed by one unit character, C or F, and the result is in Celsius, so "212F" returns 100.0. An empty string gives Empty. If the last character is neither C nor F, it gives BadUnit with that character, which may be non-ASCII. A number that does not parse gives BadNumber. Implement Display and std::error::Error for TempError, with source() returning the parse error for BadNumber, and implement From<std::num::ParseFloatError> for it.

assistant

use std::fmt;

#[derive(Debug)]
pub enum TempError {
    Empty,
    BadUnit(char),
    BadNumber(std::num::ParseFloatError),
}

impl fmt::Display for TempError {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match self {
            TempError::Empty => f.write_str("empty temperature string"),
            TempError::BadUnit(c) => write!(f, "invalid unit: {c}"),
            TempError::BadNumber(e) => write!(f, "invalid number: {e}"),
        }
    }
}

impl std::error::Error for TempError {
    fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
        match self {
            TempError::BadNumber(e) => Some(e),
            _ => None,
        }
    }
}

impl From<std::num::ParseFloatError> for TempError {
    fn from(err: std::num::ParseFloatError) -> Self {
        TempError::BadNumber(err)
    }
}

pub fn parse_temp(s: &str) -> Result<f64, TempError> {
    if s.is_empty() {
        return Err(TempError::Empty);
    }
    let unit = s.chars().last().unwrap();
    let num_str = &s[..s.len() - unit.len_utf8()];
    let value: f64 = num_str.parse()?;
    match unit {
        'C' => Ok(value),
        'F' => Ok((value - 32.0) * 5.0 / 9.0),
        _ => Err(TempError::BadUnit(unit)),
    }
}

Turn #21Raw score: 1

246 in2,724 out2,340 reasoning128 cached2,970 total17.5s

user

Write Rust for the 2024 edition on stable, using only the standard library. Answer with one ```rust code block that defines what the question describes. Do not include fn main, tests, examples, explanations, or print statements.

Define enum TempError deriving Debug, with the variants Empty, BadUnit(char), and BadNumber(std::num::ParseFloatError), and write parse_temp(s: &str) -> Result<f64, TempError>. The input is a number followed by one unit character, C or F, and the result is in Celsius, so "212F" returns 100.0. An empty string gives Empty. If the last character is neither C nor F, it gives BadUnit with that character, which may be non-ASCII. A number that does not parse gives BadNumber. Implement Display and std::error::Error for TempError, with source() returning the parse error for BadNumber, and implement From<std::num::ParseFloatError> for it.

assistant

#[derive(Debug)]
pub enum TempError {
    Empty,
    BadUnit(char),
    BadNumber(std::num::ParseFloatError),
}

impl std::fmt::Display for TempError {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        match self {
            TempError::Empty => write!(f, "empty string"),
            TempError::BadUnit(c) => write!(f, "bad unit: {}", c),
            TempError::BadNumber(e) => write!(f, "bad number: {}", e),
        }
    }
}

impl std::error::Error for TempError {
    fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
        match self {
            TempError::BadNumber(e) => Some(e),
            _ => None,
        }
    }
}

impl From<std::num::ParseFloatError> for TempError {
    fn from(err: std::num::ParseFloatError) -> Self {
        TempError::BadNumber(err)
    }
}

pub fn parse_temp(s: &str) -> Result<f64, TempError> {
    if s.is_empty() {
        return Err(TempError::Empty);
    }
    let mut chars = s.chars();
    let unit = chars.next_back().unwrap();
    let num_str = chars.as_str();
    if unit != 'C' && unit != 'F' {
        return Err(TempError::BadUnit(unit));
    }
    let value: f64 = num_str.parse().map_err(TempError::from)?;
    Ok(if unit == 'F' {
        (value - 32.0) * 5.0 / 9.0
    } else {
        value
    })
}

Turn #22Raw score: 1

147 in4,607 out4,439 reasoning4,754 total31.1s

user

Write Rust for the 2024 edition on stable, using only the standard library. Answer with one ```rust code block that defines what the question describes. Do not include fn main, tests, examples, explanations, or print statements.

Write parallel_sum(data: &[u64], workers: usize) -> u64, which sums data by splitting it across workers threads from std::thread. data is a borrowed slice, and workers may be larger than data.len(). It returns 0 for an empty slice and panics when workers is 0, including when the slice is empty.

assistant

fn parallel_sum(data: &[u64], workers: usize) -> u64 {
    assert!(workers != 0, "workers must be greater than 0");
    if data.is_empty() {
        return 0;
    }
    let len = data.len();
    std::thread::scope(|s| {
        let mut handles = Vec::with_capacity(workers);
        for i in 0..workers {
            let start = i * len / workers;
            let end = (i + 1) * len / workers;
            let chunk = &data[start..end];
            handles.push(s.spawn(move || chunk.iter().sum::<u64>()));
        }
        handles.into_iter().map(|h| h.join().unwrap()).sum()
    })
}

Turn #23Raw score: 1

147 in2,973 out2,794 reasoning128 cached3,120 total20.6s

user

Write Rust for the 2024 edition on stable, using only the standard library. Answer with one ```rust code block that defines what the question describes. Do not include fn main, tests, examples, explanations, or print statements.

Write parallel_sum(data: &[u64], workers: usize) -> u64, which sums data by splitting it across workers threads from std::thread. data is a borrowed slice, and workers may be larger than data.len(). It returns 0 for an empty slice and panics when workers is 0, including when the slice is empty.

assistant

use std::thread;

pub fn parallel_sum(data: &[u64], workers: usize) -> u64 {
    assert!(workers != 0);
    if data.is_empty() {
        return 0;
    }
    thread::scope(|s| {
        let mut handles = Vec::with_capacity(workers);
        let len = data.len();
        for w in 0..workers {
            let start = w * len / workers;
            let end = (w + 1) * len / workers;
            let chunk = &data[start..end];
            handles.push(s.spawn(move || chunk.iter().copied().sum::<u64>()));
        }
        let mut total = 0u64;
        for h in handles {
            total += h.join().unwrap();
        }
        total
    })
}

Turn #24Raw score: 1

147 in4,364 out4,151 reasoning4,511 total37.7s

user

Write Rust for the 2024 edition on stable, using only the standard library. Answer with one ```rust code block that defines what the question describes. Do not include fn main, tests, examples, explanations, or print statements.

Write parallel_sum(data: &[u64], workers: usize) -> u64, which sums data by splitting it across workers threads from std::thread. data is a borrowed slice, and workers may be larger than data.len(). It returns 0 for an empty slice and panics when workers is 0, including when the slice is empty.

assistant

fn parallel_sum(data: &[u64], workers: usize) -> u64 {
    assert!(workers != 0, "workers must be non-zero");
    if data.is_empty() {
        return 0;
    }
    let len = data.len();
    let chunk_size = (len + workers - 1) / workers;
    std::thread::scope(|s| {
        let mut handles = Vec::with_capacity(workers);
        for w in 0..workers {
            let start = w * chunk_size;
            if start >= len {
                handles.push(s.spawn(|| 0));
            } else {
                let end = (start + chunk_size).min(len);
                let chunk = &data[start..end];
                handles.push(s.spawn(move || chunk.iter().sum::<u64>()));
            }
        }
        let mut total = 0u64;
        for h in handles {
            total += h.join().unwrap();
        }
        total
    })
}

Turn #25Raw score: 1

137 in6,592 out6,342 reasoning6,729 total42.9s

user

Write Rust for the 2024 edition on stable, using only the standard library. Answer with one ```rust code block that defines what the question describes. Do not include fn main, tests, examples, explanations, or print statements.

Define an extension trait PairsExt that adds a method .pairs() to every iterator whose items implement Clone. It returns a lazy iterator of consecutive overlapping pairs, so (1..4).pairs() yields (1, 2) then (2, 3). A source with fewer than two items yields nothing, and an infinite source must work.

assistant

pub trait PairsExt: Iterator
where
    Self::Item: Clone,
{
    fn pairs(self) -> Pairs<Self>
    where
        Self: Sized;
}

pub struct Pairs<I: Iterator> {
    inner: I,
    prev: Option<I::Item>,
}

impl<I> PairsExt for I
where
    I: Iterator,
    I::Item: Clone,
{
    fn pairs(self) -> Pairs<Self>
    where
        Self: Sized,
    {
        Pairs { inner: self, prev: None }
    }
}

impl<I> Iterator for Pairs<I>
where
    I: Iterator,
    I::Item: Clone,
{
    type Item = (I::Item, I::Item);

    fn next(&mut self) -> Option<Self::Item> {
        if self.prev.is_none() {
            self.prev = self.inner.next();
            if self.prev.is_none() {
                return None;
            }
        }
        let curr = self.inner.next()?;
        let prev = self.prev.take().unwrap();
        self.prev = Some(curr.clone());
        Some((prev, curr))
    }
}

Turn #26Raw score: 0

137 in9,803 out9,554 reasoning9,940 total89.2s

user

Write Rust for the 2024 edition on stable, using only the standard library. Answer with one ```rust code block that defines what the question describes. Do not include fn main, tests, examples, explanations, or print statements.

Define an extension trait PairsExt that adds a method .pairs() to every iterator whose items implement Clone. It returns a lazy iterator of consecutive overlapping pairs, so (1..4).pairs() yields (1, 2) then (2, 3). A source with fewer than two items yields nothing, and an infinite source must work.

assistant

pub struct Pairs<I: Iterator> {
    iter: I,
    prev: Option<I::Item>,
}

impl<I: Iterator> Pairs<I> {
    fn new(mut iter: I) -> Self {
        Self {
            iter,
            prev: iter.next(),
        }
    }
}

impl<I> Iterator for Pairs<I>
where
    I: Iterator,
    I::Item: Clone,
{
    type Item = (I::Item, I::Item);
    fn next(&mut self) -> Option<Self::Item> {
        let prev = self.prev.take()?;
        let curr = self.iter.next()?;
        self.prev = Some(curr.clone());
        Some((prev, curr))
    }
}

pub trait PairsExt: Iterator
where
    Self::Item: Clone,
{
    fn pairs(self) -> Pairs<Self>
    where
        Self: Sized;
}

impl<I> PairsExt for I
where
    I: Iterator,
    I::Item: Clone,
{
    fn pairs(self) -> Pairs<Self>
    where
        Self: Sized,
    {
        Pairs::new(self)
    }
}

Turn #27Raw score: 1

137 in5,352 out5,097 reasoning128 cached5,489 total48.0s

user

Write Rust for the 2024 edition on stable, using only the standard library. Answer with one ```rust code block that defines what the question describes. Do not include fn main, tests, examples, explanations, or print statements.

Define an extension trait PairsExt that adds a method .pairs() to every iterator whose items implement Clone. It returns a lazy iterator of consecutive overlapping pairs, so (1..4).pairs() yields (1, 2) then (2, 3). A source with fewer than two items yields nothing, and an infinite source must work.

assistant

pub trait PairsExt: Iterator
where
    Self::Item: Clone,
{
    fn pairs(self) -> Pairs<Self>
    where
        Self: Sized;
}

impl<T> PairsExt for T
where
    T: Iterator,
    T::Item: Clone,
{
    fn pairs(self) -> Pairs<Self>
    where
        Self: Sized,
    {
        Pairs { iter: self, prev: None }
    }
}

pub struct Pairs<I: Iterator> {
    iter: I,
    prev: Option<I::Item>,
}

impl<I: Iterator> Iterator for Pairs<I>
where
    I::Item: Clone,
{
    type Item = (I::Item, I::Item);
    fn next(&mut self) -> Option<Self::Item> {
        if let Some(prev) = self.prev.take() {
            let curr = self.iter.next()?;
            self.prev = Some(curr.clone());
            Some((prev, curr))
        } else {
            let first = self.iter.next()?;
            let second = self.iter.next()?;
            self.prev = Some(second.clone());
            Some((first, second))
        }
    }
}

Turn #28Raw score: 1

198 in2,346 out2,101 reasoning2,544 total28.6s

user

Write Rust for the 2024 edition on stable, using only the standard library. Answer with one ```rust code block that defines what the question describes. Do not include fn main, tests, examples, explanations, or print statements.

Define TreeNode with exactly these fields: value: i32, parent: RefCell<Weak<TreeNode>>, and children: RefCell<Vec<Rc<TreeNode>>>, importing those types from the standard library. Write TreeNode::new(value: i32) -> Rc<TreeNode>. Write TreeNode::add_child(parent: &Rc<TreeNode>, child: Rc<TreeNode>), which also sets the child's parent. Write sum(&self) -> i32, the total of this node and all its descendants, and depth(&self) -> usize, the number of ancestors, which is 0 for a root.

assistant

use std::cell::RefCell;
use std::rc::{Rc, Weak};

struct TreeNode {
    value: i32,
    parent: RefCell<Weak<TreeNode>>,
    children: RefCell<Vec<Rc<TreeNode>>>,
}

impl TreeNode {
    fn new(value: i32) -> Rc<TreeNode> {
        Rc::new(TreeNode {
            value,
            parent: RefCell::new(Weak::new()),
            children: RefCell::new(Vec::new()),
        })
    }

    fn add_child(parent: &Rc<TreeNode>, child: Rc<TreeNode>) {
        *child.parent.borrow_mut() = Rc::downgrade(parent);
        parent.children.borrow_mut().push(child);
    }

    fn sum(&self) -> i32 {
        let mut total = self.value;
        for child in self.children.borrow().iter() {
            total += child.sum();
        }
        total
    }

    fn depth(&self) -> usize {
        if let Some(parent) = self.parent.borrow().upgrade() {
            parent.depth() + 1
        } else {
            0
        }
    }
}

Turn #29Raw score: 1

198 in2,136 out1,889 reasoning2,334 total19.5s

user

Write Rust for the 2024 edition on stable, using only the standard library. Answer with one ```rust code block that defines what the question describes. Do not include fn main, tests, examples, explanations, or print statements.

Define TreeNode with exactly these fields: value: i32, parent: RefCell<Weak<TreeNode>>, and children: RefCell<Vec<Rc<TreeNode>>>, importing those types from the standard library. Write TreeNode::new(value: i32) -> Rc<TreeNode>. Write TreeNode::add_child(parent: &Rc<TreeNode>, child: Rc<TreeNode>), which also sets the child's parent. Write sum(&self) -> i32, the total of this node and all its descendants, and depth(&self) -> usize, the number of ancestors, which is 0 for a root.

assistant

use std::cell::RefCell;
use std::rc::{Rc, Weak};

pub struct TreeNode {
    value: i32,
    parent: RefCell<Weak<TreeNode>>,
    children: RefCell<Vec<Rc<TreeNode>>>,
}

impl TreeNode {
    pub fn new(value: i32) -> Rc<TreeNode> {
        Rc::new(TreeNode {
            value,
            parent: RefCell::new(Weak::new()),
            children: RefCell::new(Vec::new()),
        })
    }

    pub fn add_child(parent: &Rc<TreeNode>, child: Rc<TreeNode>) {
        *child.parent.borrow_mut() = Rc::downgrade(parent);
        parent.children.borrow_mut().push(child);
    }

    pub fn sum(&self) -> i32 {
        let mut total = self.value;
        for child in self.children.borrow().iter() {
            total += child.sum();
        }
        total
    }

    pub fn depth(&self) -> usize {
        match self.parent.borrow().upgrade() {
            Some(parent) => 1 + parent.depth(),
            None => 0,
        }
    }
}

Turn #30Raw score: 1

198 in2,179 out1,926 reasoning128 cached2,377 total25.6s

user

Write Rust for the 2024 edition on stable, using only the standard library. Answer with one ```rust code block that defines what the question describes. Do not include fn main, tests, examples, explanations, or print statements.

Define TreeNode with exactly these fields: value: i32, parent: RefCell<Weak<TreeNode>>, and children: RefCell<Vec<Rc<TreeNode>>>, importing those types from the standard library. Write TreeNode::new(value: i32) -> Rc<TreeNode>. Write TreeNode::add_child(parent: &Rc<TreeNode>, child: Rc<TreeNode>), which also sets the child's parent. Write sum(&self) -> i32, the total of this node and all its descendants, and depth(&self) -> usize, the number of ancestors, which is 0 for a root.

assistant

use std::cell::RefCell;
use std::rc::{Rc, Weak};

pub struct TreeNode {
    value: i32,
    parent: RefCell<Weak<TreeNode>>,
    children: RefCell<Vec<Rc<TreeNode>>>,
}

impl TreeNode {
    pub fn new(value: i32) -> Rc<TreeNode> {
        Rc::new(TreeNode {
            value,
            parent: RefCell::new(Weak::new()),
            children: RefCell::new(Vec::new()),
        })
    }

    pub fn add_child(parent: &Rc<TreeNode>, child: Rc<TreeNode>) {
        *child.parent.borrow_mut() = Rc::downgrade(parent);
        parent.children.borrow_mut().push(child);
    }

    pub fn sum(&self) -> i32 {
        let mut total = self.value;
        for child in self.children.borrow().iter() {
            total += child.sum();
        }
        total
    }

    pub fn depth(&self) -> usize {
        let parent_opt = self.parent.borrow().upgrade();
        match parent_opt {
            Some(parent) => 1 + parent.depth(),
            None => 0,
        }
    }
}

Run Detail

Recorded for these videos

Turns (30)