T10 SIII ex 2

#include <iostream>

using namespace std;

int main() {
    int m, n, a[21][21] = {}, vf[20] = {}, ok = 0;
    cin >> m >> n;

    for(int i = 1; i <= m; i++) {      ///m linii
        for(int j = 1; j <= n; j++) {  ///n coloane
            cin >> a[i][j];
            if(i == 1 && j <= n - 1) vf[a[i][j]]++; ///cresc frecv elem de pe prima linie
            if(j == n && i != 1) {    ///verific ultima coloana
                vf[a[i][j]]++;
                if(vf[a[i][j]] == 2) cout << a[i][j] << ' ', ok = 1;
            }
        }
    }

    if(ok == 0) cout << "nu exista";
    return 0;
}