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weakvertices.cpp
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weakvertices.cpp
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// Weak Vertices
#include <algorithm>
#include <iostream>
#include <vector>
using namespace std;
int main(void) {
int N;
while (cin >> N) {
if (N == -1)
break;
vector<vector<int>> adj_matrix(N, vector<int>(N));
for (int i = 0; i < N; ++i) {
for (int j = 0; j < N; ++j) {
cin >> adj_matrix[i][j];
}
}
for (int i = 0; i < N; ++i) {
bool weak = true;
for (int j = 0; j < N && weak; ++j) {
for (int k = 0; k < N && weak; ++k) {
if (i == j || j == k || i == k)
continue;
if (adj_matrix[i][j] == adj_matrix[j][k] &&
adj_matrix[j][k] == adj_matrix[i][k] &&
adj_matrix[k][i] == 1) {
weak = false;
}
}
}
if (weak)
cout << i << ' ';
}
cout << '\n';
}
return 0;
}