Ruudukko

#include <iostream>
#include <fstream>
#include <algorithm>
 
using namespace std;
 
int main() {
    int n;
    cin >> n;
    int a[n][n];
    int k1 = 0, k2 = 0;
    for (int i = 0; i < n; ++i) {
        for (int j = 0; j < n; ++j) {
            a[i][j] = 2;
        }
    }
    for(int i = 0; i < n; ++i) {
        if(!(i & 1)) {
            a[i][k1] = 1;
            ++k1;
        } else {
            a[i][n - k2 - 1] = 1;
            ++k2;
        }
    }
    for(int i = 0; i < n; ++i) {
        for(int j = 0; j < n; ++j) {
            cout << a[i][j] << " ";
        }
        cout << endl;
    }
    return 0;
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: WRONG ANSWER

Test 4

Verdict: WRONG ANSWER

Test 5

Verdict: WRONG ANSWER

Test 6

Verdict: WRONG ANSWER