| 16 | |
| 17 | |
| 18 | pub fn buddy_strings(s: String, goal: String) -> bool { |
| 19 | if &s.len() != &goal.len() { |
| 20 | return false; |
| 21 | } |
| 22 | if s == goal { |
| 23 | let mut s_chars: Vec<char> = s.clone().chars().collect(); |
| 24 | s_chars.sort_unstable(); |
| 25 | s_chars.dedup(); |
| 26 | s_chars.len() < s.len() |
| 27 | } else { |
| 28 | let mut tmp: Vec<char> = vec!(); |
| 29 | for (i, c) in s.chars().enumerate() { |
| 30 | let o = goal.chars().nth(i).unwrap(); |
| 31 | if c != o { |
| 32 | tmp.push(c); |
| 33 | tmp.push(o); |
| 34 | } |
| 35 | if tmp.len() > 4 { |
| 36 | return false; |
| 37 | } |
| 38 | } |
| 39 | if tmp.len() != 4 { |
| 40 | return false; |
| 41 | } |
| 42 | tmp[0] == tmp[3] && tmp[1] == tmp[2] |
| 43 | } |
| 44 | } |
| 45 | |
| 46 | fn main() { |
| 47 | let s = "abab".to_string(); |