A30642.沙漏 题解

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