AC题解

#include<iostream>
using namespace std;
int main(void){
    int a;
    int b;
    cin>>b;
    for(a=1;a<=b;a++){
        for(int c=1;c<=b-a;++c){

            cout<<" ";

        }
        for(int s=1;s<=2*a-1;++s){
            cout<<"*";
        }cout<<endl;   
    }
}