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-rw-r--r--longest_palindrome_concat.rs39
1 files changed, 39 insertions, 0 deletions
diff --git a/longest_palindrome_concat.rs b/longest_palindrome_concat.rs
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+++ b/longest_palindrome_concat.rs
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+struct Solution;
+
+impl Solution {
+ pub fn longest_palindrome(words: Vec<String>) -> i32 {
+ let (mut hist, mut ans, a_code) = (vec![vec![0; 26];26], 0, 'a' as usize);
+ for w in words.iter() {
+ if let Some(i) = w.chars().nth(0) {
+ if let Some(j) = w.chars().nth(1) {
+ let i = i as usize - a_code;
+ let j = j as usize - a_code;
+ match hist[j][i] {
+ cnt if cnt > 0 => {
+ ans += 4;
+ hist[j][i] -= 1;
+ },
+ _ => {
+ hist[i][j] += 1;
+ }
+ }
+ }
+ }
+ }
+ for i in 0..26 {
+ match hist[i][i] {
+ cnt if cnt > 0 => {
+ ans += 2;
+ break;
+ },
+ _ => (),
+ }
+ }
+ ans
+ }
+}
+
+fn main() {
+ let words = vec!["lc".to_string(), "cl".to_string(), "gg".to_string()];
+ print!("{}", Solution::longest_palindrome(words));
+}