Grid

input/code.cpp: In function 'int main()':
input/code.cpp:8:16: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&N);
                ^

#include <bits/stdc++.h>
#define MAXN 1005
 
using namespace std;
 
int main () {
	int N;
	scanf("%d",&N);
	if (N < 4) {
		printf("QAQ\n");
		return 0;
	}
	if (N == 4) {
		printf("3 2 4 3\n");
		printf("1 2 2 1\n");
		printf("1 3 3 1\n");
		printf("4 4 4 2\n");
		return 0;
	}
	static int a[MAXN][MAXN];
	static int h[MAXN];
	static int v[MAXN];
	a[0][0] = 1; a[0][1] = 1; a[0][2] = 2; a[0][3] = 4; a[0][4] = 3; v[0] = 11;
	a[1][0] = 2; a[1][1] = 5; a[1][2] = 2; a[1][3] = 2; a[1][4] = 3; v[1] = 14;
	a[2][0] = 3; a[2][1] = 1; a[2][2] = 4; a[2][3] = 3; a[2][4] = 4; v[2] = 15;
	a[3][0] = 1; a[3][1] = 2; a[3][2] = 4; a[3][3] = 4; a[3][4] = 5; v[3] = 16;
	a[4][0] = 1; a[4][1] = 3; a[4][2] = 5; a[4][3] = 5; a[4][4] = 5; v[4] = 19;
	   h[0] = 8;    h[1] = 12;   h[2] = 17;   h[3] = 18;   h[4] = 20;
	int n = 5;
	while (n < N) {
		int hp = 0;
		int vp = 0;
		int cur = 1;
		while ((hp < n) || (vp < n)) {
			if ((hp < n) && (vp < n)) {
				if (h[hp] < v[vp]) {
					a[n][hp] = cur;
					hp++;
				} else if (h[hp] > v[vp]) {
					a[vp][n] = cur;
					vp++;
				}
			} else if (hp < n) {
				a[n][hp] = cur;
				hp++;
			} else {
				a[vp][n] = cur;
				vp++;
			}
			cur++;
			if (cur > n+1) cur--;
		}
		a[n][n] = cur;
		h[n] = cur;
		v[n] = cur;
		for (int i = 0; i < n; i++) {
			h[i] += a[n][i];
			v[n] += a[n][i];
			v[i] += a[i][n];
			h[n] += a[i][n];
		}
		if (h[n] == v[n]) {
			int temp = a[n][0]; a[n][0] = a[0][n]; a[0][n] = temp;
			for (int i = 0; i < n; i++) {
				h[i] -= a[n][i];
				v[i] -= a[i][n];
			}
			h[n] = cur;
			v[n] = cur;
			for (int i = 0; i < n; i++) {
				h[i] += a[n][i];
				v[n] += a[n][i];
				v[i] += a[i][n];
				h[n] += a[i][n];
			}
		}
		n++;
	}
	for (int i = 0; i < N; i++) {
		for (int j = 0; j < N; j++) {
			if (j) printf(" ");
			printf("%d",a[i][j]);
		}
		printf("\n");
	}
	return 0;
}

Test 1

Group: 1

Verdict: ACCEPTED

Test 2

Group: 1

Verdict: ACCEPTED

Test 3

Group: 1

Verdict: ACCEPTED

Test 4

Group: 1

Verdict: ACCEPTED

Test 5

Group: 1

Verdict: ACCEPTED

Test 6

Group: 1

Verdict: ACCEPTED

Test 7

Group: 1

Verdict: ACCEPTED

Test 8

Group: 1

Verdict: ACCEPTED

Test 9

Group: 1

Verdict: ACCEPTED

Test 10

Group: 2

Verdict: ACCEPTED

Test 11

Group: 2

Verdict: ACCEPTED

Test 12

Group: 2

Verdict: ACCEPTED

Test 13

Group: 2

Verdict: ACCEPTED

Test 14

Group: 2

Verdict: ACCEPTED

Test 15

Group: 2

Verdict: ACCEPTED

Test 16

Group: 3

Verdict: ACCEPTED

Test 17

Group: 3

Verdict: ACCEPTED

Test 18

Group: 3

Verdict: ACCEPTED

Test 19

Group: 3

Verdict: ACCEPTED

Test 20

Group: 3

Verdict: ACCEPTED

Test 21

Group: 3

Verdict: ACCEPTED