func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n, t;     scanf( %d%d , &n, &t);     int x, y;     vector<pair<int, int> > v(n);     for (int i = 0; i < (int)(n); ++i) {       scanf( %d%d , &x, &y);       v[i].first = x;       v[i].second = y;     }     int a[4] = {v[0].first, v[0].second, 7 - v[0].first, 7 - v[0].second};     bool f = true;     for (int i = 0; i < (int)(n); ++i) {       if (find(a, a + 4, v[i].first) == a + 4 or           find(a, a + 4, v[i].second) == a + 4)         f = false;     }     cout << (f ?  YES  :  NO );   }   