LeetCode/rs/longest-palindromic-subsequence.rs

use std::cmp;

struct Solution {}
impl Solution {
    pub fn longest_palindrome_subseq(s: String) -> i32 {
        let mut longest: Vec<Vec<i32>> = vec![];
        longest.resize_with(s.len(), || {
            let mut nested: Vec<i32> = vec![];
            nested.resize(s.len(), 0);

            nested
        });

        for i in (0..s.len()).rev() {
            longest[i][i] = 1;

            for j in i + 1..s.len() {
                if s.as_bytes()[i] == s.as_bytes()[j] {
                    longest[i][j] = 2 + longest[i + 1][j - 1];
                } else {
                    longest[i][j] = cmp::max(longest[i + 1][j], longest[i][j - 1]);
                }
            }
        }

        longest[0][s.len() - 1]
    }
}

fn main() {}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn with_skip() {
        assert_eq!(Solution::longest_palindrome_subseq("bbbab".to_owned()), 4);
    }

    #[test]
    fn without_skip() {
        assert_eq!(Solution::longest_palindrome_subseq("cbbd".to_owned()), 2);
    }
}