#include <bits/stdc++.h> using namespace std; int main(){ int a; cin >> a; for(int j = 1;j <= a;j++){ for(int i = 1;i <= a - j;i++){ cout << " "; } for(int k = 1;k <= 2 * j - 1;k++){ cout << "*"; } cout << endl; } return 0; }

说明：第一个

#include <bits/stdc++.h> using namespace std; int main(){ int n; cin>>n; for(int i=1;i<=n;++i) { for(int k=1;k<=n-i;++k) cout<<" "; }