PROG-T1019: DNA

#include <bits/stdc++.h>
using namespace std;

const int N = 200;

string strA, strB;
int dp[N + 1][N + 1];

int main(){

    cin >> strA >> strB;
    int mx = 0;
    int idx = 0;
    for(int i = 1; i <= strA.size(); ++i){
        for(int j = 1; j <= strB.size(); ++j){
            if(strA[i - 1] == strB[j - 1]){
                dp[i][j] = 1 + dp[i - 1][j - 1];
            }
            if(dp[i][j] > mx){
                mx = dp[i][j];
                idx = i;
            }
        }
    }
    cout << strA.substr(idx - mx, mx);

    return 0;
}