#include<bits/stdc++.h> using namespace std; int main() { /* 输入一个变量n 输出n行n列矩阵 例如 5 ***** ***** ***** ***** ***** */ int n; cin >> n; for (int i = 1; i <= n; i++) { for(int k=1;k<=n-i;k++){ cout<<" "; } for (int j = 1; j <= i*2-1; j++) { cout << "*"; } cout << endl; } for(int i=n-1;i>=1;i--){ for(int k=1;k<=n-i;k++){ cout<<" "; } for(int j=1;j<=i*2-1;j++){ cout<<"*"; }cout<<endl; } }