include[HTML_REMOVED]
include[HTML_REMOVED]
include[HTML_REMOVED]
using namespace std;
int arr[100][100];
int main() {
int n;
bool flag = 1;
while (cin >> n) {
flag = 1;
for (int i = 0; i < n; i) {
for (int j = 0; j < n; j)
cin >> arr[i][j];
}
for (int i = 0; i < n; i) {
for (int j = 0; j < i; j)
if (arr[i][j] != arr[j][i]) {
flag = 0;
break;
}
if (!flag)
break;
}
if (flag)
cout << “Yes!” << endl;
else
cout << “No!” << endl;
}
}