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<=(2i-1);j++){
cout<<"";
}
cout<<endl;
}
}