Ruudukko

#include <iostream>
#include <string>
using namespace std;
int main()
{
	int max;
	string output;
	cin >> max;
	int num[200];
	for (int i = 0; i < max; i++) {
		num[i] = i;
	}
	for (int i = 0; i < max; i++) {
		num[i + max] = max - i;
	}
	for (int y = 1; y < max + 1; y++) {
		for (int x = 0; x < max; x++) {
			output += to_string(num[x + y]);
			output += x == max - 1 ? "\n" : " ";
		}
	}
	cout << output;
}

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