小题解

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