#include <iostream> #include <string> using namespace std; int main() { int T, n; cin >> T; while (T--) { cin >> n; for (int i = 0; i < n; i++) { for (int j = 0; j < n; j++) { if (j == i || j == n - 1 - i) cout << 'X'; else cout << ' '; } cout << "\n"; } cout << "\n"; // 每组输出后空一行 } return 0; }