Envío 4055

Código

#include <bits/stdc++.h>
using namespace std;

#define endl '\n'
#define ll long long
#define sz(x) int(x.size())
#define dbg(x) cout << #x << " = " << x << endl

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    int n; cin >> n;
    int val[n][n];
    unordered_set<int> st;
    for (int i = 0; i < n; ++i) {
        int sum = 0;
        for (int j = 0; j < n; ++j) {
            cin >> val[i][j];
            sum += val[i][j];
        }
        st.insert(sum);
    }
    for (int i = 0; i < n; ++i) {
        int sum = 0;
        for (int j = 0; j < n; ++j) {
            sum += val[i][j];
        }
        st.insert(sum);
    }
    int sum = 0;
    for (int i = 0; i < n; ++i) {
        sum += val[i][i];
    }
    st.insert(sum);
    sum = 0;
    for (int i = 0; i < n; ++i) {
        sum += val[i][n - i - 1];
    }
    st.insert(sum);
    if (sz(st) != 1) cout << "No" << endl;
    else cout << "Yes" << endl;
    return 0;
}