google/gemma-3-4b-it on Rust Quick Ten

Turn #1Raw score: 1

100 in140 out240 total3.3s

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 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 mut filtered_chars = Vec::new();
    for c in s.chars() {
        if c.is_ascii_alphanumeric() {
            filtered_chars.push(c.to_ascii_lowercase());
        }
    }

    let len = filtered_chars.len();
    for i in 0..len / 2 {
        if filtered_chars[i] != filtered_chars[len - 1 - i] {
            return false;
        }
    }

    true
}

Turn #2Raw score: 1

100 in109 out209 total2.0s

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 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 mut cleaned_string = String::new();
    for c in s.chars() {
        if c.is_ascii_alphanumeric() {
            cleaned_string.push(c.to_ascii_lowercase());
        }
    }

    let reversed_string: String = cleaned_string.chars().rev().collect();

    cleaned_string == reversed_string
}

Turn #3Raw score: 0

100 in157 out257 total2.9s

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 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 mut filtered_chars: Vec<char> = s
        .chars()
        .filter(|c| c.is_ascii_alphanumeric())
        .map(|c| c.to_lowercase().next().unwrap())
        .collect();

    let mut left = 0;
    let mut right = filtered_chars.len() - 1;

    while left < right {
        if filtered_chars[left] != filtered_chars[right] {
            return false;
        }
        left += 1;
        right -= 1;
    }

    true
}

Turn #4Raw score: 1

113 in104 out217 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 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<String, usize> = HashMap::new();

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

    counts
}

Turn #5Raw score: 1

113 in104 out217 total1.3s

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<String, usize> = HashMap::new();

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

    counts
}

Turn #6Raw score: 1

113 in104 out217 total1.6s

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<String, usize> = HashMap::new();

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

    counts
}

Turn #7Raw score: 0

105 in59 out164 total0.9s

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

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

Turn #8Raw score: 0

105 in59 out164 total0.8s

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

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

Turn #9Raw score: 0

105 in59 out164 total1.4s

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 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

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

Turn #10Raw score: 1

178 in136 out314 total1.6s

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 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 parts: Vec<&str> = s.split(sep).collect();
    if parts.len() != 2 {
        return None;
    }

    match (parts[0].parse::<T>(), parts[1].parse::<T>()) {
        (Ok(val1), Ok(val2)) => Some((val1, val2)),
        _ => None,
    }
}

Turn #11Raw score: 1

178 in136 out314 total1.6s

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 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 parts: Vec<&str> = s.split(sep).collect();
    if parts.len() != 2 {
        return None;
    }

    match (parts[0].parse::<T>(), parts[1].parse::<T>()) {
        (Ok(val1), Ok(val2)) => Some((val1, val2)),
        _ => None,
    }
}

Turn #12Raw score: 1

178 in136 out314 total3.4s

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 parts: Vec<&str> = s.split(sep).collect();
    if parts.len() != 2 {
        return None;
    }

    match (parts[0].parse::<T>(), parts[1].parse::<T>()) {
        (Ok(val1), Ok(val2)) => Some((val1, val2)),
        _ => None,
    }
}

Turn #13Raw score: 0

129 in74 out203 total1.0s

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<F, G, T, U>(f: F, g: G) -> impl Fn(T) -> U
where
    F: Fn(T) -> U,
    G: Fn(U) -> U,
{
    move |x| g(f(x))
}

Turn #14Raw score: 0

129 in74 out203 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 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, T, U>(f: F, g: G) -> impl Fn(T) -> U
where
    F: Fn(T) -> U,
    G: Fn(U) -> U,
{
    move |x| g(f(x))
}

Turn #15Raw score: 0

129 in74 out203 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 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, T, U>(f: F, g: G) -> impl Fn(T) -> U
where
    F: Fn(T) -> U,
    G: Fn(U) -> U,
{
    move |x| g(f(x))
}

Turn #16Raw score: 0

143 in137 out280 total2.0s

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

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

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

impl Iterator for Fib {
    type Item = u64;

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

Turn #17Raw score: 0

143 in137 out280 total1.6s

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

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

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

impl Iterator for Fib {
    type Item = u64;

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

Turn #18Raw score: 0

143 in156 out299 total4.5s

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

use std::iter::Iterator;

#[derive(Clone, Copy)]
pub struct Fib {
    pub a: u64,
    pub b: u64,
}

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

impl Iterator for Fib {
    type Item = u64;

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

Turn #19Raw score: 0

252 in460 out712 total5.7s

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, "Invalid unit character: {}", c),
            TempError::BadNumber(e) => write!(f, "Invalid number: {}", e),
        }
    }
}

impl std::error::Error for TempError {}

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

fn parse_temp(s: &str) -> Result<f64, TempError> {
    let parts: Vec<&str> = s.rsplitn(2, ' ').collect();

    match parts.len() {
        0 => Err(TempError::Empty),
        1 => Err(TempError::BadNumber(s.parse::<f64>().map_err(|e| e)?)),
        2 => {
            let num_str = parts[0];
            let unit = parts[1];

            let num = num_str.parse::<f64>().map_err(|e| e)?;

            match unit {
                "C" => Ok(num),
                "F" => {
                    let celsius = (num - 32.0) * 5.0 / 9.0;
                    Ok(celsius)
                }
                _ => Err(TempError::BadUnit(unit.chars().next().unwrap())),
            }
        }
        _ => Err(TempError::BadUnit(s.chars().last().unwrap())),
    }
}

Turn #20Raw score: 0

252 in446 out698 total5.3s

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 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, "Invalid unit character: {}", c),
            TempError::BadNumber(e) => write!(f, "Invalid number: {}", e),
        }
    }
}

impl std::error::Error for TempError {}

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

fn parse_temp(s: &str) -> Result<f64, TempError> {
    let parts: Vec<&str> = s.rsplitn(2, ' ').collect();

    match parts.len() {
        0 => Err(TempError::Empty),
        1 => Err(TempError::BadNumber(s.parse::<f64>()?)),
        2 => {
            let num_str = parts[0];
            let unit = parts[1];

            let num = num_str.parse::<f64>()?;

            match unit {
                "C" => Ok(num),
                "F" => {
                    let celsius = (num - 32.0) * 5.0 / 9.0;
                    Ok(celsius)
                }
                _ => Err(TempError::BadUnit(unit.chars().next().unwrap())),
            }
        }
        _ => Err(TempError::BadUnit(s.chars().last().unwrap())),
    }
}

Turn #21Raw score: 0

252 in481 out733 total5.5s

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::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 std::error::Error for TempError {}

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

impl std::fmt::Error for TempError {}

fn parse_temp(s: &str) -> Result<f64, TempError> {
    if s.is_empty() {
        return Err(TempError::Empty);
    }

    let mut parts = s.splitn(2, |c| *c == 'C' || *c == 'F');
    match parts.next() {
        Some(num_str) => {
            match num_str.parse::<f64>() {
                Ok(num) => {
                    let unit = parts.next();
                    match unit {
                        Some(c) => {
                            if *c == 'C' {
                                Ok(num)
                            } else if *c == 'F' {
                                Ok(num - 32.0)
                            } else {
                                Err(TempError::BadUnit(*c))
                            }
                        }
                        None => Err(TempError::BadUnit(*c)),
                    }
                }
                Err(e) => Err(TempError::BadNumber(e)),
            }
        }
        None => Err(TempError::BadUnit('\0')),
    }
}

Turn #22Raw score: 0

149 in242 out391 total5.6s

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 {
    if workers == 0 {
        panic!("Workers must be greater than 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 = std::cmp::min((i + 1) * chunk_size, data.len());
        let chunk = &data[start..end];

        let handle = thread::spawn(move || {
            chunk.iter().sum::<u64>()
        });
        handles.push(handle);
    }

    let mut total_sum = 0;
    for handle in handles {
        total_sum += handle.join().unwrap();
    }

    total_sum
}

Turn #23Raw score: 0

149 in242 out391 total3.2s

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 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 must be greater than 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 = std::cmp::min((i + 1) * chunk_size, data.len());
        let chunk = &data[start..end];

        let handle = thread::spawn(move || {
            chunk.iter().sum::<u64>()
        });
        handles.push(handle);
    }

    let mut total_sum = 0;
    for handle in handles {
        total_sum += handle.join().unwrap();
    }

    total_sum
}

Turn #24Raw score: 0

149 in240 out389 total3.0s

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 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;

parallel_sum(data: &[u64], workers: usize) -> u64 {
    if workers == 0 {
        panic!("Workers must be greater than 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 = std::cmp::min((i + 1) * chunk_size, data.len());
        let chunk = &data[start..end];

        let handle = thread::spawn(move || {
            chunk.iter().sum::<u64>()
        });
        handles.push(handle);
    }

    let mut total_sum = 0;
    for handle in handles {
        total_sum += handle.join().unwrap();
    }

    total_sum
}

Turn #25Raw score: 0

137 in125 out262 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.

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

ext trait PairsExt {
    fn pairs(self) -> impl Iterator<Item = (T, T)> {
        let mut it = self;
        std::iter::from_fn(move || {
            if let Some(val1) = it.next() {
                if let Some(val2) = it.next() {
                    Some((val1.clone(), val2.clone()))
                } else {
                    None
                }
            } else {
                None
            }
        })
    }
}

Turn #26Raw score: 0

137 in117 out254 total1.4s

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

ext trait PairsExt {
    fn pairs(self) -> impl Iterator<Item = (T, T)> {
        let mut iterator = self;
        std::iter::from_fn(move || {
            if let Some(first) = iterator.next() {
                if let Some(second) = iterator.next() {
                    Some((first, second))
                } else {
                    None
                }
            } else {
                None
            }
        })
    }
}

Turn #27Raw score: 0

137 in124 out261 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.

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

extend! {
    pub trait PairsExt<T> {
        fn pairs(&self) -> impl Iterator<Item = (T, T)> {
            let mut iterator = self.clone();
            std::iter::from_fn(move || {
                if iterator.clone().next().is_none() {
                    return None;
                }

                let first = iterator.next().unwrap();
                let second = iterator.next().unwrap();

                Some((first, second))
            })
        }
    }
}

Turn #28Raw score: 0

201 in316 out517 total3.6s

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;
use std::weak::Weak;

#[derive(Debug)]
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(&self, child: Rc<TreeNode>) {
        self.children.borrow_mut().push(child);
        child.parent.borrow_mut().replace(Rc::downgrade(self));
    }

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

    fn depth(&self) -> usize {
        let mut depth = 0;
        let mut current = Some(self);
        while let Some(node) = current {
            depth += 1;
            current = node.parent.borrow().upgrade();
        }
        depth
    }
}

Turn #29Raw score: 0

201 in297 out498 total6.6s

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;
use weak::Weak;

#[derive(Debug)]
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(&self, child: Rc<TreeNode>) {
        self.children.borrow_mut().push(child);
        child.parent.borrow_mut().replace(Rc::downgrade(&self.clone()));
    }

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

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

Turn #30Raw score: 0

201 in297 out498 total6.6s

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;
use weak::Weak;

#[derive(Debug)]
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(&self, child: Rc<TreeNode>) {
        self.children.borrow_mut().push(child);
        child.parent.borrow_mut().replace(Rc::downgrade(&self.clone()));
    }

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

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

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