Nick Thomas
cb0c5fa868
git-subtree-dir: 2018 git-subtree-mainline:5ccd921b23git-subtree-split:4f35fa8515
49 lines
1.0 KiB
Rust
49 lines
1.0 KiB
Rust
use std::collections::HashMap;
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use std::error::Error;
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use std::fs::File;
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use std::io::BufReader;
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use std::io::prelude::*;
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fn main() -> std::io::Result<()> {
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let file = match File::open("input") {
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Err(why) => panic!("couldn't open input: {}", Error::description(&why)),
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Ok(file) => file,
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};
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let reader = BufReader::new(file);
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let lines = reader.lines();
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for result in lines {
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let l = result.unwrap();
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let mut freq = HashMap::new();
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let mut is2 = false;
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let mut is3 = false;
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for ch in l.chars() {
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let count = freq.entry(ch).or_insert(0);
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*count += 1;
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}
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for (_ch, count) in freq {
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if count == 2 {
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is2 = true;
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}
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if count == 3 {
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is3 = true;
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}
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}
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if is2 {
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count2+=1;
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}
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if is3 {
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count3+=1;
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}
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}
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println!("2: {} 3: {} 2*3: {}", count2, count3, count2 * count3);
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Ok(())
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}
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