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45 lines
854 B
45 lines
854 B
8 years ago
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use std::collections::HashMap;
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use errors::*;
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pub fn solve(input: &str) -> Result<String> {
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let mut counters = HashMap::new();
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for line in input.lines() {
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for (i, c) in line.chars().enumerate() {
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let mut col = counters.entry(i).or_insert_with(|| HashMap::new());
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*col.entry(c).or_insert(0) += 1
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}
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}
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let mut counters: Vec<_> = counters.iter().collect();
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counters.sort_by_key(|&(idx, _)| idx);
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Ok(counters.iter()
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.map(|&(_, col)| {
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let mut v: Vec<_> = col.iter().collect();
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v.sort_by_key(|&(_, count)| count);
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v.iter().map(|&(chr, _)| *chr).last().unwrap()
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})
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.collect())
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}
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#[test]
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fn test_solve() {
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let input = "eedadn
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drvtee
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eandsr
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raavrd
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atevrs
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tsrnev
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sdttsa
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rasrtv
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nssdts
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ntnada
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svetve
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tesnvt
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vntsnd
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vrdear
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dvrsen
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enarar";
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assert_eq!(solve(input).unwrap(), "easter".to_string());
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}
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