qwen/qwen3-14b on Rust Quick Ten

Turn #1Raw score: 1

98 in878 out909 reasoning976 total41.5s

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 filtered: String = s.chars()
        .filter(|c| c.is_ascii_alphanumeric())
        .map(|c| c.to_ascii_lowercase())
        .collect();
    filtered == filtered.chars().rev().collect::<String>()
}

Turn #2Raw score: 1

98 in1,231 out1,275 reasoning1,329 total55.1s

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 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 filtered: String = s.chars()
        .filter(|c| c.is_ascii_alphabetic() || c.is_ascii_digit())
        .map(|c| c.to_ascii_lowercase())
        .collect();
    filtered == filtered.chars().rev().collect::<String>()
}

Turn #3Raw score: 1

98 in799 out857 reasoning897 total40.7s

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 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 processed: String = s.chars()
        .filter(|c| c.is_ascii_alphanumeric())
        .map(|c| c.to_ascii_lowercase())
        .collect();
    processed == processed.chars().rev().collect::<String>()
}

Turn #4Raw score: 1

108 in1,013 out1,032 reasoning1,121 total52.0s

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 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 lower = word.to_lowercase();
        *counts.entry(lower).or_insert(0) += 1;
    }
    counts
}

Turn #5Raw score: 1

108 in1,083 out1,134 reasoning1,191 total48.5s

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;

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

Turn #6Raw score: 1

108 in79 out1 reasoning187 total1.1s

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 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 counts = HashMap::new();
    for word in text.split_whitespace() {
        let lower_word = word.to_lowercase();
        *counts.entry(lower_word).or_insert(0) += 1;
    }
    counts
}

Turn #7Raw score: 0

105 in516 out492 reasoning621 total25.1s

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 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: &str, b: &str) -> &str {
    if a.len() >= b.len() { a } else { b }
}

Turn #8Raw score: 0

105 in662 out637 reasoning767 total17.2s

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 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(s1: &str, s2: &str) -> &str {
    if s1.len() >= s2.len() {
        s1
    } else {
        s2
    }
}

Turn #9Raw score: 0

105 in781 out750 reasoning886 total39.9s

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: &str, b: &str) -> &str {
    if a.len() > b.len() {
        a
    } else if b.len() > a.len() {
        b
    } else {
        a
    }
}

Turn #10Raw score: 0

174 in118 out1 reasoning292 total2.1s

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 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 idx = s.find(sep)?;
    let (left, right) = s.split_at(idx);
    let left = left.trim();
    let right = right.get(1..).unwrap_or_default().trim();
    T::from_str(left).ok().and_then(|l| T::from_str(right).ok().map(|r| (l, r)))
}

Turn #11Raw score: 0

174 in1,141 out1,047 reasoning1,315 total63.2s

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 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 split = s.split_once(sep)?;
    let (left, right) = split;
    Some((T::from_str(left)?, T::from_str(right)?))
}

Turn #12Raw score: 0

174 in118 out1 reasoning292 total13.3s

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 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 idx = s.find(sep)?;
    let (left, right) = s.split_at(idx);
    let left = left.trim();
    let right = right.get(1..).unwrap_or_default().trim();
    T::from_str(left).ok().and_then(|l| T::from_str(right).ok().map(|r| (l, r)))
}

Turn #13Raw score: 1

126 in2,631 out2,886 reasoning2,757 total106.6s

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 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

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

Turn #14Raw score: 1

126 in2,158 out2,358 reasoning2,284 total95.7s

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

fn compose<F, G, A, B, C>(f: F, g: G) -> Box<dyn Fn(A) -> C + 'static>
where
    F: Fn(A) -> B + 'static,
    G: Fn(B) -> C + 'static,
{
    Box::new(move |x| g(f(x)))
}

Turn #15Raw score: 1

126 in3,111 out3,461 reasoning3,237 total108.3s

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 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

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| g(f(x))
}

Turn #16Raw score: 0

143 in8,594 out8,754 reasoning8,737 total279.3s

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.

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

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

impl Fib {
    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;
        let new_a = self.b;
        let new_b = self.a.checked_add(self.b);

        if let Some(new_b) = new_b {
            self.a = new_a;
            self.b = new_b;
        } else {
            self.done = true;
        }

        Some(current)
    }
}

Turn #17Raw score: 0

143 in7,336 out7,394 reasoning7,479 total229.4s

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 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

struct Fib {
    current: u64,
    next: u64,
    done: bool,
}

impl Fib {
    fn new() -> Self {
        Fib {
            current: 0,
            next: 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.current;
        let next_sum = self.current.checked_add(self.next);
        if next_sum.is_none() {
            self.done = true;
            return Some(current);
        }
        self.current = self.next;
        self.next = next_sum.unwrap();
        Some(current)
    }
}

Turn #18Raw score: 0

143 in14,618 out16,399 reasoning14,761 total341.6s

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 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

struct Fib {
    a: u64,
    b: u64,
}

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

impl Iterator for Fib {
    type Item = u64;

    fn next(&mut self) -> Option<Self::Item> {
        let current = self.a;
        let new_a = self.b;
        let new_b = self.a.checked_add(self.b)?;

        self.a = new_a;
        self.b = new_b;

        Some(current)
    }
}

Turn #19Raw score: 1

247 in3,473 out3,194 reasoning3,720 total125.0s

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 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::num::ParseFloatError;
use std::fmt::Display;
use std::error::Error;

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

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

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

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

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 num_str = &s[0..s.len() - 1];

    let num = num_str.parse::<f64>().map_err(TempError::BadNumber)?;
    let celsius = if unit_char == 'F' {
        (num - 32.0) * 5.0 / 9.0
    } else {
        num
    };

    Ok(celsius)
}

Turn #20Raw score: 1

247 in3,087 out2,703 reasoning3,334 total79.7s

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.

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)]
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 character: {}", 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(e: std::num::ParseFloatError) -> Self {
        TempError::BadNumber(e)
    }
}

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 num_str = &s[0..s.len() - 1];
    let num = num_str.parse::<f64>().map_err(TempError::BadNumber)?;
    let celsius = if unit_char == 'F' {
        (num - 32.0) * 5.0 / 9.0
    } else {
        num
    };
    Ok(celsius)
}

Turn #21Raw score: 1

247 in2,815 out2,455 reasoning3,062 total51.5s

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

use std::fmt;
use std::error;
use std::num::ParseFloatError;

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

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

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

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

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 number_str = &s[0..s.len() - 1];
    let temp = number_str.parse::<f64>().map_err(TempError::BadNumber)?;
    let celsius = if unit_char == 'F' {
        (temp - 32.0) * 5.0 / 9.0
    } else {
        temp
    };
    Ok(celsius)
}

Turn #22Raw score: 0

145 in5,126 out5,027 reasoning5,271 total82.9s

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 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;
use std::sync::Arc;

fn parallel_sum(data: &[u64], workers: usize) -> u64 {
    if workers == 0 {
        panic!("workers is 0");
    }
    if data.is_empty() {
        return 0;
    }
    let len = data.len();
    let chunk_size = (len + workers - 1) / workers;
    let vec_data = data.to_vec();
    let arc_data = Arc::new(vec_data);
    let mut handles = vec![];
    for i in 0..workers {
        let start = i * chunk_size;
        let end = (i + 1) * chunk_size;
        let end = end.min(len);
        let arc_data = Arc::clone(&arc_data);
        let handle = thread::spawn(move || {
            let slice = &arc_data[start..end];
            slice.iter().copied().sum::<u64>()
        });
        handles.push(handle);
    }
    handles.into_iter().map(|h| h.join().unwrap()).sum()
}

Turn #23Raw score: 0

145 in4,267 out3,992 reasoning4,412 total71.4s

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 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

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

Turn #24Raw score: 0

145 in4,648 out4,323 reasoning4,793 total64.4s

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 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 {
    if workers == 0 {
        panic!("workers is 0");
    }
    if data.is_empty() {
        return 0;
    }
    let chunk_size = (data.len() + workers - 1) / workers;
    let mut handles = vec![];
    for i in 0..workers {
        let start = i * chunk_size;
        let end = (i + 1) * chunk_size;
        let end = end.min(data.len());
        let chunk = &data[start..end];
        let handle = thread::spawn(move || chunk.iter().sum::<u64>());
        handles.push(handle);
    }
    let mut total = 0;
    for handle in handles {
        total += handle.join().unwrap();
    }
    total
}

Turn #25Raw score: 0

133 in3,870 out4,157 reasoning4,003 total53.4s

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 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 {
    fn pairs(self) -> impl Iterator<Item = (Self::Item, Self::Item)>
    where
        Self::Item: Clone;
}

impl<T, I> PairsExt for I
where
    I: Iterator<Item = T>,
    T: Clone,
{
    fn pairs(self) -> impl Iterator<Item = (T, T)> {
        self.scan(None, move |state, item| {
            if let Some(prev) = state.take() {
                let output = (prev.clone(), item.clone());
                *state = Some(item.clone());
                Some(output)
            } else {
                *state = Some(item.clone());
                None
            }
        })
    }
}

Turn #26Raw score: 0

133 in6,343 out6,712 reasoning6,476 total87.9s

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

use std::iter::Iterator;

pub trait PairsExt: Iterator<Item: Clone> {
    fn pairs(self) -> impl Iterator<Item = (Self::Item, Self::Item)> {
        self.scan(None, move |state: &mut Option<Self::Item>, item| {
            let prev = state.take();
            if let Some(prev) = prev {
                *state = Some(item.clone());
                Some((prev, item))
            } else {
                *state = Some(item.clone());
                None
            }
        })
    }
}

Turn #27Raw score: 0

133 in7,050 out7,329 reasoning7,183 total76.7s

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.

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) -> impl Iterator<Item = (Self::Item, Self::Item)>;
}

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

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 current = self.iter.next()?;
        match self.prev {
            None => {
                self.prev = Some(current.clone());
                None
            }
            Some(prev) => {
                let result = (prev, current);
                self.prev = Some(current.clone());
                Some(result)
            }
        }
    }
}

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

Turn #28Raw score: 0

191 in2,520 out2,343 reasoning2,711 total26.3s

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.

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::rc::{Rc, RefCell, Weak};

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

impl TreeNode {
    pub fn new(value: i32) -> Rc<Self> {
        Rc::new(TreeNode {
            value,
            parent: RefCell::new(Weak::new()),
            children: RefCell::new(vec![]),
        })
    }

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

    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 {
        if let Some(parent) = self.parent.borrow().upgrade() {
            parent.depth() + 1
        } else {
            0
        }
    }
}

Turn #29Raw score: 1

191 in3,086 out2,998 reasoning3,277 total43.0s

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

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

    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 {
        if let Some(parent) = self.parent.borrow().upgrade() {
            1 + parent.depth()
        } else {
            0
        }
    }
}

Turn #30Raw score: 1

191 in1,959 out1,780 reasoning2,150 total21.8s

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

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>) {
        parent.children.borrow_mut().push(child.clone());
        *child.parent.borrow_mut() = Rc::downgrade(parent);
    }

    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() {
            1 + parent.depth()
        } else {
            0
        }
    }
}

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