题解

#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;
}