蛇形方阵c++顺时针输出

以下是蛇形方阵C++顺时针输出的代码：

#include <iostream>
#include <iomanip>
#define ll long long
using namespace std;

ll s[1000][1000];

int main() {
    int n, i = 1, j = 0, sum = 1;
    cin >> n;
    while (sum <= n * n) {
        while (s[i][++j] == 0 && j <= n) {
            s[i][j] = sum++;
        }
        j--;
        while (s[++i][j] == 0 && i <= n) {
            s[i][j] = sum++;
        }
        i--;
        while (s[i][--j] == 0 && j >= 1) {
            s[i][j] = sum++;
        }
        j++;
        while (s[--i][j] == 0 && i >= 1) {
            s[i][j] = sum++;
        }
        i++;
    }
    for (j = 1; j <= n; j++) {
        for (i = 1; i <= n; i++) {
            cout << setw(3) << setfill(' ') << s[i][j];
        }
        cout << endl;
    }
    return 0;
}