打印沙漏

题目:
​​​题目链接​​

题解:
纯模拟

#include <bits/stdc++.h>
using namespace std;
int ans[1005];
int b[1005];
int main()
{
  int n;
  cin>>n;
  char a;
  cin>>a;
  int r=1;
  int f=r;
  int l=1;
  int re=l;
  for(int i=1;i<=n;i++)
  {
    if(i==r)
    {
      f=r;
      re=l;
      ans[i]=i;
      b[i]=l;
      l+=2;
      r+=2*l;
    }
    else if(i<r) ans[i]=f,b[i]=re; 
  //  cout<<l<<" "<<r<<" "<<ans[i]<<" "<<b[i]<<endl;
  }
  for(int i=b[n];i>=1;i-=2)
  {
    for(int j=0;j<(b[n]-i)/2;j++) cout<<" ";
    for(int j=1;j<=i;j++)
    {
      cout<<a;
    }
    cout<<endl;
  }
  for(int i=1+2;i<=b[n];i+=2)
  {
    for(int j=0;j<(b[n]-i)/2;j++) cout<<" ";
    for(int j=1;j<=i;j++)
    {
      cout<<a;
    }
    cout<<endl;
  }
  cout<<n-ans[n]<<endl;
  return 0;
}