01 specification

Summing Integers

Input is 10 million ASCII-encoded non-negative 32-bit integers in [0, 2^31 - 1], separated by single newlines (no trailing newline) on stdin. Print their sum to stdout.

Example: input "123\n45\n678" → output "846".

Inspired by https://blog.mattstuchlik.com/2024/07/12/summing-integers-fast.html.

minimal Rust solution

use std::io::Read;

fn main() {
    let mut input = String::new();
    std::io::stdin().read_to_string(&mut input).unwrap();
    let sum: u64 = input
        .split('\n')
        .filter(|line| !line.is_empty())
        .map(|line| line.parse::<u64>().unwrap())
        .sum();
    print!("{sum}");
}

02 scope / runtime over time

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