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#include <iostream> #include <fstream> using namespace std; string A, B; int memo[3005][3005]; int lcs(int i, int j) { if(i == -1 or j == -1) { return 0; } if(memo[i][j] != -1) { return memo[i][j]; } int result = 0; if(A[i] == B[j]) { result = max(result, lcs(i - 1, j - 1) + 1); } result = max(result, lcs(i - 1, j)); result = max(result, lcs(i, j - 1)); return memo[i][j] = result; } int main() { cin >> A >> B; for(int i = 0; i < 3004; i++) { for(int j = 0; j < 3004; j++) { memo[i][j] = -1; } } cout << lcs(A.size() - 1, B.size() - 1) << endl; return 0; }
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