diff options
Diffstat (limited to 'works/solutions/leetcode/rust/src/longest_palindrome.rs')
| -rw-r--r-- | works/solutions/leetcode/rust/src/longest_palindrome.rs | 98 |
1 files changed, 98 insertions, 0 deletions
diff --git a/works/solutions/leetcode/rust/src/longest_palindrome.rs b/works/solutions/leetcode/rust/src/longest_palindrome.rs new file mode 100644 index 0000000..659ffe0 --- /dev/null +++ b/works/solutions/leetcode/rust/src/longest_palindrome.rs @@ -0,0 +1,98 @@ +use super::Solution;
+
+impl Solution {
+ pub fn longest_palindrome(s: String) -> String {
+ let bytes = s.as_bytes();
+ let len = bytes.len();
+
+ return match len {
+ 0 => "".to_string(),
+ 1 => s,
+ _ => {
+ let mut max_length = 1;
+ let mut result = &bytes[0..1];
+
+ for i in 1..len {
+ let mut left_iter = bytes[..i].iter().enumerate().rev();
+ let mut odd_right_iter = bytes.iter().enumerate().skip(i + 1);
+ let mut even_right_iter = bytes.iter().enumerate().skip(i);
+ let mut count_odd = true;
+ let mut count_even = true;
+ while count_odd || count_even {
+ match left_iter.next() {
+ Some((index_left, left)) => {
+ if count_odd {
+ match odd_right_iter.next() {
+ Some((index_right, right)) => {
+ if right == left {
+ let length = index_right - index_left + 1;
+ if length > max_length {
+ max_length = length;
+ result = &bytes[index_left..index_right + 1];
+ }
+ } else {
+ count_odd = false;
+ }
+ }
+ None => count_odd = false,
+ }
+ }
+ if count_even {
+ match even_right_iter.next() {
+ Some((index_right, right)) => {
+ if right == left {
+ let length = index_right - index_left + 1;
+ if length > max_length {
+ max_length = length;
+ result = &bytes[index_left..index_right + 1];
+ }
+ } else {
+ count_even = false;
+ }
+ }
+ None => count_even = false,
+ }
+ }
+ }
+ None => break,
+ }
+ }
+ }
+ String::from_utf8(Vec::from(result)).unwrap()
+ }
+ };
+ }
+}
+
+#[cfg(test)]
+mod tests {
+ use super::Solution;
+
+ #[test]
+ fn test() {
+ assert_eq!(
+ Solution::longest_palindrome("bb".to_string()),
+ "bb".to_string()
+ );
+ assert_eq!(
+ Solution::longest_palindrome("abb".to_string()),
+ "bb".to_string()
+ );
+ assert_eq!(
+ Solution::longest_palindrome("abbc".to_string()),
+ "bb".to_string()
+ );
+ assert_eq!(
+ Solution::longest_palindrome("abccb".to_string()),
+ "bccb".to_string()
+ );
+ assert_eq!(
+ Solution::longest_palindrome("abcdcbd".to_string()),
+ "bcdcb".to_string()
+ );
+ assert_eq!(
+ Solution::longest_palindrome("aaaabaaa".to_string()),
+ "aaabaaa".to_string()
+ );
+ }
+}
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