| 1 | pub fn common_chars(words: Vec<String>) -> Vec<String> { |
| 2 | let words_len = words.len(); |
| 3 | use std::collections::HashMap; |
| 4 | let mut mmp: HashMap<String, Vec<i32>> = HashMap::new(); |
| 5 | for c in 'a'..'z' { |
| 6 | mmp.insert(c.to_string(), vec!()); |
| 7 | } |
| 8 | for word in words { |
| 9 | let mut tmp = HashMap::new(); |
| 10 | let word_cs: Vec<String> = word.chars().map(|e|e.to_string()).collect(); |
| 11 | for c in word_cs { |
| 12 | let count = tmp.entry(c).or_insert(0); |
| 13 | *count += 1; |
| 14 | } |
| 15 | for (k, v) in tmp { |
| 16 | mmp.entry(k).or_insert(Vec::new()).push(v); |
| 17 | } |
| 18 | } |
| 19 | mmp.retain(|_, v| v.len() == words_len); |
| 20 | let mut ret: Vec<String> = vec!(); |
| 21 | for (k, v) in mmp { |
| 22 | let min = v.iter().min().unwrap(); |
| 23 | for _ in 0..*min { |
| 24 | ret.push(k.clone()); |
| 25 | } |
| 26 | } |
| 27 | ret |
| 28 | } |
| 29 | |
| 30 | fn main() { |
| 31 | let words = vec!["bella","label","roller"] |