projecteuler.net/042/main.rs

use std::fs::read_to_string;
use std::collections::HashSet;

fn sn(s: &str) -> u32 {
    let st = String::from(s);
    let mut res = 0;
    for c in st.chars() {
        if c == '"' {
            continue;
        }
        let d = c as u32 - 64;
        res += d;
        //println!("{}", d);
    }
    return res;
}

fn main() {
    let mut hs = HashSet::new();
    for n in 1..200 {
        let tn = (n * (n + 1)) / 2;
        hs.insert(tn);
    }
    let mut count = 0;
    for line in read_to_string("0042_words.txt").unwrap().lines() {
        let sp = line.split(',');
        for s in sp {
            let n = sn(&s);
            //println!("{} {}", s, n);
            if hs.contains(&n) {
                count += 1;
            }
        }
    }
    //let r = sn("SKY");
    println!("{}", count);
}