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23 lines
471 B
23 lines
471 B
#include <iostream>
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using namespace std;
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const int N = 110;
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int a[N], b[N];
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int main() {
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int n;
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cin >> n;
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for (int i = 1; i <= n; i++)
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for (int j = 1; j <= n; j++) {
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int x;
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cin >> x;
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a[j] += x;
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b[i] += x;
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}
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for (int i = 1; i <= n; i++)
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if (a[i] != a[1] || b[i] != a[1]) {
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puts("NO");
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return 0;
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}
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puts("YES");
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return 0;
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} |