qwen/qwen3-14b on Rust Quick Ten

Turn #1Raw score: 0

98 in1,281 out1,364 reasoning1,379 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.

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

Turn #2Raw score: 1

98 in1,112 out1,171 reasoning1,210 total17.1s

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

Turn #3Raw score: 1

98 in960 out1,018 reasoning1,058 total14.7s

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 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 #4Raw score: 1

108 in930 out990 reasoning1,038 total14.3s

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 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 in1,153 out1,192 reasoning1,261 total16.7s

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

Turn #6Raw score: 1

108 in101 out1 reasoning209 total1.7s

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 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(|c: char| c.is_whitespace())
        .filter(|s| !s.is_empty())
        .map(|s| s.to_lowercase())
    {
        *counts.entry(word).or_insert(0) += 1;
    }
    counts
}

Turn #7Raw score: 0

105 in10,158 out11,198 reasoning10,263 total164.5s

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

Turn #8Raw score: 0

105 in678 out618 reasoning783 total9.9s

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

Turn #9Raw score: 1

105 in605 out589 reasoning710 total8.7s

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

Turn #10Raw score: 0

174 in118 out1 reasoning292 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 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(|a| T::from_str(right).ok().map(|b| (a, b)))
}

Turn #11Raw score: 0

174 in1,726 out1,581 reasoning1,900 total24.8s

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 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

fn parse_pair<T: FromStr>(s: &str, sep: char) -> Option<(T, T)> {
    let sep_index = s.find(sep)?;
    let left_str = &s[..sep_index];
    let right_str = &s[sep_index + 1..];
    let left = T::from_str(left_str).ok()?;
    let right = T::from_str(right_str).ok()?;
    Some((left, right))
}

Turn #12Raw score: 0

174 in97 out1 reasoning271 total1.5s

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

Turn #13Raw score: 1

126 in1,702 out1,869 reasoning1,828 total24.7s

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

Turn #14Raw score: 1

126 in1,106 out1,109 reasoning1,232 total15.9s

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

Turn #15Raw score: 1

126 in1,781 out1,800 reasoning1,907 total26.9s

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 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 #16Raw score: 0

143 in9,500 out10,360 reasoning9,643 total161.0s

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 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,
    overflowed: bool,
}

impl Fib {
    fn new() -> Self {
        Fib {
            current: 0,
            next: 1,
            overflowed: false,
        }
    }
}

impl Iterator for Fib {
    type Item = u64;

    fn next(&mut self) -> Option<Self::Item> {
        if self.overflowed {
            return None;
        }

        let current = self.current;
        let new_current = self.next;
        let new_next = self.current.checked_add(self.next);

        if new_next.is_none() {
            self.overflowed = true;
        } else {
            self.current = new_current;
            self.next = new_next.unwrap();
        }

        Some(current)
    }
}

Turn #17Raw score: 0

143 in16,384 out16,270 reasoning16,527 total272.2s

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.

Turn #18Raw score: 0

143 in14,536 out15,251 reasoning14,679 total241.2s

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

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

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

impl Iterator for Fib {
    type Item = u64;

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

Turn #19Raw score: 0

247 in3,722 out3,243 reasoning3,969 total57.0s

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::fmt;
use std::error::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"),
            TempError::BadUnit(c) => write!(f, "Bad unit: {}", c),
            TempError::BadNumber(e) => write!(f, "{}", 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)
    }
}

fn parse_temp(s: &str) -> Result<f64, TempError> {
    if s.is_empty() {
        return Err(TempError::Empty);
    }
    let unit_char = s.chars().last().unwrap();
    let unit_str = &s[0..s.len() - 1];
    let unit = if unit_char == 'C' {
        'C'
    } else if unit_char == 'F' {
        'F'
    } else {
        return Err(TempError::BadUnit(unit_char));
    };
    let num: f64 = unit_str.parse().map_err(TempError::BadNumber)?;
    let celsius = if unit == 'C' {
        num
    } else {
        (num - 32.0) * 5.0 / 9.0
    };
    Ok(celsius)
}

Turn #20Raw score: 1

247 in8,386 out8,131 reasoning8,633 total151.1s

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.

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::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, "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)
    }
}

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 temp_f = num_str.parse::<f64>().map_err(TempError::from)?;
    if unit_char == 'F' {
        Ok((temp_f - 32.0) * 5.0 / 9.0)
    } else {
        Ok(temp_f)
    }
}

Turn #21Raw score: 1

247 in2,834 out2,412 reasoning3,081 total42.4s

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

#[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 character: {}", c),
            TempError::BadNumber(e) => write!(f, "failed to parse 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)
    }
}

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 temp: f64 = num_str.parse().map_err(TempError::from)?;
    let celsius = if unit_char == 'F' {
        (temp - 32.0) * 5.0 / 9.0
    } else {
        temp
    };
    Ok(celsius)
}

Turn #22Raw score: 0

145 in6,491 out5,659 reasoning6,636 total102.1s

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

use std::thread;

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

Turn #23Raw score: 1

145 in6,294 out5,811 reasoning6,439 total101.8s

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 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;

fn parallel_sum(data: &[u64], workers: usize) -> u64 {
    if workers == 0 {
        panic!("workers is 0");
    }
    if data.is_empty() {
        return 0;
    }
    let data_vec = data.to_vec();
    let mut handles = vec![];
    for i in 0..workers {
        let start = (data.len() * i) / workers;
        let end = (data.len() * (i + 1)) / workers;
        let chunk = data_vec[start..end].to_vec();
        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 #24Raw score: 0

145 in7,616 out6,849 reasoning7,761 total124.5s

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 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 n = data.len();
    let chunk_size = n / workers;
    let remainder = n % workers;
    let handles: Vec<_> = (0..workers).map(|i| {
        let start = if i < remainder {
            i * (chunk_size + 1)
        } else {
            i * chunk_size + remainder
        };
        let end = start + if i < remainder { chunk_size + 1 } else { chunk_size };
        let data_ref = data;
        thread::spawn(move || {
            let slice = &data_ref[start..end];
            slice.iter().sum::<u64>()
        })
    }).collect();
    handles.into_iter().map(|h| h.join().unwrap()).sum()
}

Turn #25Raw score: 0

133 in3,394 out3,236 reasoning3,527 total51.7s

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) -> Pairs<Self>;
}

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

impl<I> Pairs<I>
where
    I: Iterator,
    I::Item: Clone,
{
    fn new(iter: I) -> Self {
        Pairs { iter, 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> {
        let current = self.iter.next()?;
        let prev = self.prev.take();
        let prev = match prev {
            Some(p) => p,
            None => {
                self.prev = Some(current.clone());
                return None;
            }
        };
        self.prev = Some(current.clone());
        Some((prev, current))
    }
}

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

Turn #26Raw score: 0

133 in4,484 out4,554 reasoning4,617 total75.2s

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

use std::iter::Iterator;

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

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

impl<I> PairsExt for I where I: Iterator, I::Item: Clone {
    fn pairs(self) -> Pairs<Self> {
        Pairs { iter: 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> {
        let current = self.iter.next()?;
        match self.prev {
            Some(prev_val) => {
                let result = Some((prev_val.clone(), current.clone()));
                self.prev = Some(current);
                result
            }
            None => {
                self.prev = Some(current);
                None
            }
        }
    }
}

Turn #27Raw score: 0

133 in7,444 out7,700 reasoning7,577 total122.8s

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 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>;
}

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> {
        if let Some(prev) = self.prev {
            let current = self.iter.next()?;
            self.prev = Some(current.clone());
            return Some((prev, current));
        } else {
            let first = self.iter.next()?;
            let second = self.iter.next()?;
            self.prev = Some(second.clone());
            return Some((first, second));
        }
    }
}

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 in4,105 out4,174 reasoning4,296 total66.4s

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

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

Turn #29Raw score: 0

191 in3,835 out3,857 reasoning4,026 total65.5s

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

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

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

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

Turn #30Raw score: 0

191 in4,317 out4,333 reasoning4,508 total74.1s

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.

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 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
        }
    }
}

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

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