#include <iostream>
#include <vector>
using namespace std;
vector<vector<int>> generateMatrix(int n) {
vector<vector<int>> matrix(n, vector<int>(n, 0));
int top = 0, bottom = n - 1, left = 0, right = n - 1;
int num = 1;
while (top <= bottom && left <= right) {
for (int i = left; i <= right; ++i)
matrix[top][i] = num++;
top++;
for (int i = top; i <= bottom; ++i)
matrix[i][right] = num++;
right--;
if (top <= bottom) {
for (int i = right; i >= left; --i)
matrix[bottom][i] = num++;
bottom--;
}
if (left <= right) {
for (int i = bottom; i >= top; --i)
matrix[i][left] = num++;
left++;
}
}
return matrix;
}
int main() {
int n = 4;
vector<vector<int>> result = generateMatrix(n);
for (const vector<int>& row : result) {
for (int num : row) {
cout << num << " ";
}
cout << endl;
}
return 0;
}