https://pintia.cn/problem-sets/994805260223102976/problems/994805285812551680 简单
#include <iostream> using namespace std; int main(){ int a, b; char c; cin >> a >> c; b = (a+1) / 2; for(int i = 0; i < a; i++) cout << c; cout << endl; for(int i = 0; i < b-2; i++){ cout << c; for(int j = 0; j < a-2; j++) cout << " "; cout << c << endl; } for(int i = 0; i < a; i++) cout << c; return 0; }