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re: Daily Coding Problem #1 VIEW POST

FULL DISCUSSION
 

Rust solution:

use std::collections::HashSet;

fn two_add_upto(list: &[i32], k: i32) -> bool {
    let mut set = HashSet::with_capacity(list.len());

    for i in list.iter() {
        let diff = k - i;
        if set.contains(&diff) {
            return true;
        }
        set.insert(i);
    }
    false
}

Made a sized Set to overcome the reallocation and copying of data. This increases the Size requirement to O(N).

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