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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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