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LC 516. Longest Palindromic Subsequence

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Given a string s, find the longest palindromic subsequence‘s length in s. You may assume that the maximum length of s is 1000.

Example 1:
Input:

"bbbab"

Output:

4

One possible longest palindromic subsequence is "bbbb".

Example 2:
Input:

"cbbd"

Output:

2

One possible longest palindromic subsequence is "bb".

Runtime: 128 ms, faster than 59.09% of C++ online submissions for Longest Palindromic Subsequence. Memory Usage: 90.5 MB, less than 0.79% of C++ online submissions for Longest Palindromic Subsequence.
class Solution {
public:
  int longestPalindromeSubseq(string s) {
    int N = s.size();
    vector
<vector<int>> dp(N, vector<int>(N,0)); for(int i=0; i<N; i++) { dp[i][i] = 1; } for(int gap=1; gap<s.size(); gap++) { for(int i=0; i<N; i++) { int j = i+gap; if(i+gap >= N) continue; if(s[i] == s[j]) { dp[i][j] = dp[i+1
][j-1]+2; } else { dp[i][j] = max(dp[i+1][j],dp[i][j-1]); } } } return dp[0][N-1]; } };

LC 516. Longest Palindromic Subsequence