蛇形方阵顺时针输出c++

以下是蛇形方阵顺时针输出的C++代码：

#include <iostream>
using namespace std;

int main() {
    int n;
    cin >> n;
    int arr[n][n];
    int num = 1;
    int row_start = 0, row_end = n - 1, col_start = 0, col_end = n - 1;
    while (row_start <= row_end && col_start <= col_end) {
        for (int i = col_start; i <= col_end; i++) {
            arr[row_start][i] = num++;
        }
        row_start++;
        for (int i = row_start; i <= row_end; i++) {
            arr[i][col_end] = num++;
        }
        col_end--;
        for (int i = col_end; i >= col_start; i--) {
            arr[row_end][i] = num++;
        }
        row_end--;
        for (int i = row_end; i >= row_start; i--) {
            arr[i][col_start] = num++;
        }
        col_start++;
    }
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < n; j++) {
            cout << arr[i][j] << " ";
        }
        cout << endl;
    }
    return 0;
}