P3088 [USACO13NOV]Crowded Cows

#include<iostream>
#include<cstdio>
#include<algorithm>
#include<cstring>
using namespace std;
struct pd{int x,y;//x表示坐标，y表示高度
}a[100001];
pd stk[100001];
bool q[100001],h[100001];//q[i]用来存储在点的左边拥挤的个数，h[i]存储右边拥挤个数
inline bool cmp(pd a,pd b)
{return a.x < b.x;
}
int main()
{int n,d;scanf("%d%d",&n,&d);for(int i=1;i<=n;i++)scanf("%d%d",&a[i].x,&a[i].y);sort(a+1,a+n+1,cmp);int hh=1,tt=0;for(int i=1;i<=n;i++)//判断每头牛的左边是否存才比它高两倍的牛{while(hh <= tt && stk[tt].y < a[i].y) tt--;stk[++tt]=a[i];while(hh <= tt && stk[hh].x < a[i].x-d) hh++;if(stk[hh].y>=a[i].y*2)q[i]=1;}memset(stk,0,sizeof stk); hh=1; tt=0;for(int i=n;i;i--)//判断每头牛的右边是否存才比它高两倍的牛{while(hh <= tt && stk[tt].y < a[i].y) tt--;stk[++tt]=a[i];while(hh <= tt && stk[hh].x > a[i].x+d) hh++;if(stk[hh].y >= a[i].y*2) h[i]=1;}int ans=0;for(int i=1;i<=n;i++)if(q[i]&&h[i])ans++;//如果这头牛两边都有比它高两倍的就会觉得拥挤printf("%d",ans);return 0;
}

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