给同学们写一个一眼能看懂的简单代码

最外层的while，每一次循环“转一圈”

#include <iostream>
using namespace std;

int a[105][105];

int main() {
    int n;
    cin >> n;

    int num = 1;
    int left = 0, right = n - 1, top = 0, bottom = n - 1; // top代表最上面一行，bottom代表最下面熠杭

    while (left <= right && top <= bottom) {
        for (int i = left; i <= right; i++) a[top][i] = num++;
        top++;
        for (int i = top; i <= bottom; i++) a[i][right] = num++;
        right--;
        for (int i = right; i >= left; i--) a[bottom][i] = num++;
        bottom--;
        for (int i = bottom; i >= top; i--) a[i][left] = num++;
        left++;
    }

    for (int i = 0; i < n; i++) {
        for (int j = 0; j < n; j++) {
            cout << a[i][j];
            if (j != n - 1) cout << ' ';
        }
        cout << '\n';
    }

    return 0;
}