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- class Solution {
- public:
- string a, b;
- int dp[1005][1005];
- const int INF = 2e8;
- int rec(int i, int j) {
- if(i == -1) {
- return 0;
- }
- if(j == -1) {
- return 0;
- }
- if(dp[i][j] != -1) {
- return dp[i][j];
- }
- int res = -INF;
- if(a[i] == b[j]) {
- res = max(res, rec(i - 1, j - 1) + 1);
- }
- res = max(res, rec(i - 1, j));
- res = max(res, rec(i, j - 1));
- return dp[i][j] = res;
- }
- int longestCommonSubsequence(string text1, string text2) {
- a = text1;
- b = text2;
- memset(dp, -1, sizeof dp);
- return rec(a.size() - 1, b.size() - 1);
- }
- };
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