csu 1535: Pizza voting(思维)

http://acm.csu.edu.cn/OnlineJudge/showsource.php?id=97625

 

#include<cstdio>

#include<cstring>

#include<iostream>

#include<algorithm>

using namespace std;

int a[200000];

int main()

{

  int n,m;

  int i,j,k;

  while(scanf("%d%d",&n,&m)!=EOF)

  {

    int t1;

    char t2[1000];

    for(i=0;i<n;i++)

      scanf("%d%s",&t1,t2);

    int l=n/3;

    int r=n-n/3+1;

    if(n%3==2) r--;

    if(m>l&&m<r) printf("YES\n");

    else printf("NO\n");       

  }

  return 0;

}

  

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