Run Detail
completedqwen3.5-9b30 answersRecorded for these videos
Provider
openrouter
Challenge Version
v1.0
Turns
30
Duration
2987.9s
Total Tokens
805,204
Input Tokens
4,470
Output Tokens
800,734
Reasoning Tokens
799,208
Reasoning Effort
default
Est. Cost
$0.1045
Started
11/5/2026, 3:13:00 AM
OR Provider
Darkbloom
Finish Reason
length
Generation ID
gen-1793850978-R1Hp0167mLQEYNxKtNQ4
Turns (30)
Turn #1Raw score: 1
100 in15,587 out15,468 reasoning15,687 total168.9s
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 chars: Vec<char> = s
.chars()
.filter(|c| c.is_ascii_alphanumeric())
.map(|c| c.to_ascii_lowercase())
.collect();
let len = chars.len();
for i in 0..len / 2 {
if chars[i] != chars[len - 1 - i] {
return false;
}
}
true
}
Turn #2Raw score: 0
100 in8,288 out8,147 reasoning8,388 total97.0s
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
fn is_palindrome(s: &str) -> bool {
let mut buf = Vec::new();
for c in s.chars() {
if c.is_ascii_alphanumeric() {
buf.push(c.to_ascii_lowercase());
}
}
let len = buf.len();
let mut i = 0;
let mut j = len - 1;
while i < j {
if buf[i] != buf[j] {
return false;
}
i += 1;
j -= 1;
}
true
}
Turn #3Raw score: 1
100 in6,237 out6,119 reasoning6,337 total115.6s
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 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 chars: Vec<char> = s.chars()
.filter(|c| c.is_ascii_alphanumeric())
.map(|c| c.to_ascii_lowercase())
.collect();
let len = chars.len();
for i in 0..len / 2 {
if chars[i] != chars[len - 1 - i] {
return false;
}
}
true
}
Turn #4Raw score: 1
110 in13,647 out13,512 reasoning13,757 total524.1s
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;
use std::collections::hash_map::Entry;
fn word_count(text: &str) -> HashMap<String, usize> {
let mut counts = HashMap::new();
for word in text.split_whitespace() {
let key = word.to_lowercase();
match counts.entry(key) {
Entry::Occupied(mut e) => {
*e.get_mut() += 1;
}
Entry::Vacant(e) => {
e.insert(1);
}
}
}
counts
}
Turn #5Raw score: 1
110 in7,806 out7,722 reasoning7,916 total77.9s
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;
fn word_count(text: &str) -> HashMap<String, usize> {
let mut counts = HashMap::new();
for word in text.split_whitespace() {
let key = word.to_lowercase();
*counts.entry(key).or_insert(0) += 1;
}
counts
}
Turn #6Raw score: 0
110 in32,000 out31,996 reasoning32,110 total456.4s
user
Write Rust for the 2024 edition on stable, using only the standard library. Answer with one ```rust code block that defines what the question describes. Do not include fn main, tests, examples, explanations, or print statements.
Write word_count(text: &str) -> HashMap<String, usize>, importing HashMap yourself. Words are separated by any whitespace and compared in lowercase, and the map's keys are lowercase. Punctuation is part of a word.
Turn #7Raw score: 0
107 in20,899 out20,839 reasoning21,006 total219.1s
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
pub fn longest(s1: &str, s2: &str) -> &str {
if s1.len() >= s2.len() {
s1
} else {
s2
}
}
Turn #8Raw score: 1
107 in13,143 out13,078 reasoning13,250 total130.3s
user
Write Rust for the 2024 edition on stable, using only the standard library. Answer with one ```rust code block that defines what the question describes. Do not include fn main, tests, examples, explanations, or print statements.
Write longest, which takes two string slices and returns the longer one by str::len without allocating. On a tie, it returns the first. Its result must be usable as long as both inputs are alive.
assistant
pub fn longest<'a>(s1: &'a str, s2: &'a str) -> &'a str {
if s1.len() >= s2.len() {
s1
} else {
s2
}
}
Turn #9Raw score: 0
107 in32,000 out31,996 reasoning32,107 total358.5s
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.
Turn #10Raw score: 0
176 in32,000 out32,000 reasoning32,176 total660.3s
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)).
Turn #11Raw score: 0
176 in32,000 out32,000 reasoning32,176 total474.0s
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 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)).
Turn #12Raw score: 0
176 in32,000 out32,000 reasoning32,176 total392.1s
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)).
Turn #13Raw score: 0
128 in32,000 out32,000 reasoning32,128 total369.2s
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 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.
Turn #14Raw score: 0
128 in32,000 out32,000 reasoning32,128 total240.0s
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.
Turn #15Raw score: 0
128 in32,000 out32,000 reasoning32,128 total757.5s
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 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.
Turn #16Raw score: 0
145 in32,000 out32,000 reasoning32,145 total474.3s
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.
Turn #17Raw score: 0
145 in32,000 out32,000 reasoning32,145 total470.5s
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.
Turn #18Raw score: 0
145 in32,000 out32,000 reasoning32,145 total359.8s
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 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 #19Raw score: 0
249 in25,356 out24,855 reasoning25,605 total334.9s
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 enum TempError deriving Debug, with the variants Empty, BadUnit(char), and BadNumber(std::num::ParseFloatError), and write parse_temp(s: &str) -> Result<f64, TempError>. The input is a number followed by one unit character, C or F, and the result is in Celsius, so "212F" returns 100.0. An empty string gives Empty. If the last character is neither C nor F, it gives BadUnit with that character, which may be non-ASCII. A number that does not parse gives BadNumber. Implement Display and std::error::Error for TempError, with source() returning the parse error for BadNumber, and implement From<std::num::ParseFloatError> for it.
assistant
#[derive(Debug)]
pub enum TempError {
Empty,
BadUnit(char),
BadNumber(std::num::ParseFloatError),
}
impl std::fmt::Display for TempError {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
match self {
TempError::Empty => write!(f, "empty"),
TempError::BadUnit(c) => write!(f, "bad unit '{}'", c),
TempError::BadNumber(e) => write!(f, "{}", e),
}
}
}
impl std::error::Error for TempError {
fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
match self {
TempError::BadNumber(ref err) => Some(&*err as &(dyn std::error::Error + 'static)),
_ => None,
}
}
}
impl From<std::num::ParseFloatError> for TempError {
fn from(err: std::num::ParseFloatError) -> Self {
TempError::BadNumber(err)
}
}
pub fn parse_temp(s: &str) -> Result<f64, TempError> {
if s.is_empty() {
return Err(TempError::Empty);
}
let last_char = s.chars().next_back();
match last_char {
None => unreachable(),
Some('C') | Some('F') => {
let num_str = &s[..s.len() - 1];
match num_str.parse::<f64>() {
Ok(val) => {
if last_char == Some('F') {
let temp_f = val;
// Convert F to C: (F - 32) * 5/9
Ok((temp_f - 32.0) * 5.0 / 9.0)
} else {
Ok(val)
}
}
Err(e) => Err(TempError::BadNumber(e)),
}
}
Some(other) => Err(TempError::BadUnit(other)),
}
}
Turn #20Raw score: 0
249 in32,000 out32,000 reasoning32,249 total381.2s
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 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.
Turn #21Raw score: 0
249 in32,000 out32,000 reasoning32,249 total222.9s
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 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.
Turn #22Raw score: 0
147 in32,000 out32,000 reasoning32,147 total662.0s
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.
Turn #23Raw score: 0
147 in32,000 out32,000 reasoning32,147 total379.7s
user
Write Rust for the 2024 edition on stable, using only the standard library. Answer with one ```rust code block that defines what the question describes. Do not include fn main, tests, examples, explanations, or print statements.
Write parallel_sum(data: &[u64], workers: usize) -> u64, which sums data by splitting it across workers threads from std::thread. data is a borrowed slice, and workers may be larger than data.len(). It returns 0 for an empty slice and panics when workers is 0, including when the slice is empty.
Turn #24Raw score: 0
147 in32,000 out32,000 reasoning32,147 total367.7s
user
Write Rust for the 2024 edition on stable, using only the standard library. Answer with one ```rust code block that defines what the question describes. Do not include fn main, tests, examples, explanations, or print statements.
Write parallel_sum(data: &[u64], workers: usize) -> u64, which sums data by splitting it across workers threads from std::thread. data is a borrowed slice, and workers may be larger than data.len(). It returns 0 for an empty slice and panics when workers is 0, including when the slice is empty.
Turn #25Raw score: 0
135 in32,000 out31,999 reasoning32,135 total737.6s
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 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.
Turn #26Raw score: 0
135 in32,000 out32,000 reasoning32,135 total360.8s
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.
Turn #27Raw score: 0
135 in32,000 out32,000 reasoning32,135 total389.1s
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 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.
Turn #28Raw score: 0
193 in32,000 out31,999 reasoning32,193 total389.9s
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 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.
Turn #29Raw score: 0
193 in17,771 out17,484 reasoning17,964 total192.9s
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 TreeNode with exactly these fields: value: i32, parent: RefCell<Weak<TreeNode>>, and children: RefCell<Vec<Rc<TreeNode>>>, importing those types from the standard library. Write TreeNode::new(value: i32) -> Rc<TreeNode>. Write TreeNode::add_child(parent: &Rc<TreeNode>, child: Rc<TreeNode>), which also sets the child's parent. Write sum(&self) -> i32, the total of this node and all its descendants, and depth(&self) -> usize, the number of ancestors, which is 0 for a root.
assistant
use std::cell::RefCell;
use std::rc::{Rc, Weak};
pub struct TreeNode {
pub value: i32,
pub parent: RefCell<Weak<TreeNode>>,
pub children: RefCell<Vec<Rc<TreeNode>>>,
}
impl TreeNode {
pub fn new(value: i32) -> Rc<TreeNode> {
Rc::new(TreeNode {
value,
parent: RefCell::new(Weak::null()),
children: RefCell::new(Vec::new()),
})
}
pub fn add_child(parent: &Rc<TreeNode>, child: Rc<TreeNode>) {
let child_clone = child.clone();
parent.children.borrow_mut().push(child_clone);
child.parent.borrow_mut().replace(Rc::downgrade(parent));
}
pub fn sum(&self) -> i32 {
let mut total = self.value;
for rc_child in self.children.borrow().iter() {
total += rc_child.sum();
}
total
}
pub fn depth(&self) -> usize {
if let Some(parent_rc) = self.parent.borrow().upgrade() {
return 1 + parent_rc.depth();
}
0
}
}
Turn #30Raw score: 0
193 in32,000 out31,994 reasoning32,193 total388.9s
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 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.