1 min read
https://leetcode.com/problems/longest-palindromic-subsequence/
class Solution {
int dp[1005][1005];
public:
int longestPalindromeSubseq(string s) {
string rev = string(s.rbegin(), s.rend());
int n = s.size();
for (int i = 0; i <= n; i++) {
for (int j = 0; j <= n; j++) {
if (i == 0 || j == 0) {
dp[i][j] = 0;
} else if (s[i - 1] == rev[j - 1]) {
dp[i][j] = 1 + dp[i - 1][j - 1];
} else {
dp[i][j] = max(dp[i - 1][j], dp[i][j - 1]);
}
}
}
return dp[n][n];
}
};