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- #include <iostream>
- int main() {
- int a;
- std::cin>>a;
- int map[a][a];
- for (int x = 0; x < a; x++)
- for (int y = 0; y < a; y++)
- std::cin>>map[x][y];
- for (int x = 0; x < a; x++)
- for (int y = 0; y < a; y++)
- if ((x != y && map[x][y] != map[y][x]) || (x == y && map[x][y] != 0)) {
- std::cout<<"NO";
- return 0;
- }
- std::cout<<"YES";
- return 0;
- }
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