code/zheng_san_jiao_xin.cpp

//正三角形

#include<iostream>
#include<windows.h>

using namespace std;

int main(){
    int n;
    cin >>n;

    for (int i = 1; i <= n; i++)
    {
        for (int y = 1; y <= n-i; ++y)
        {
            cout <<" ";
        }
        
        for (int j = 1; j <= 2*i-1; ++j)
        {
            cout <<"*";
        }
        cout <<endl;
    }
    //Sleep(1000000000);
    return 0;
}