hdu 1823 Luck and Love

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二维线段树，写起来比较繁琐，难度并不大

#include<iostream>
#include<cstdio>
#define maxn 222
using namespace std;
int h,hh;
double a,b;
struct stus
{
	int l,r;
	double max;
};
struct stu
{
	int l,r;
	stus root[1111*4];
};
stu mapp[maxn*4];
void build2(int id,int l,int r,int count)
{
	mapp[id].root[count].l=l;
	mapp[id].root[count].r=r;
	mapp[id].root[count].max=-1.0;
	if(l==r) return ;
	int mid=(l+r)/2;
	build2(id,l,mid,count*2);
	build2(id,mid+1,r,count*2+1);
}
void build(int l,int r,int ll,int rr,int count)
{
	mapp[count].l=l;
	mapp[count].r=r;
	build2(count,ll,rr,1);
	if(l==r) return;
	int mid=(l+r)/2;
	build(l,mid,ll,rr,count*2);
	build(mid+1,r,ll,rr,count*2+1);
}
void updata2(int id,int count)
{
	mapp[id].root[count].max=max(mapp[id].root[count].max,b);
	if(mapp[id].root[count].l==mapp[id].root[count].r) return;
	int mid=(mapp[id].root[count].l+mapp[id].root[count].r)/2;
	if(a<=mid) updata2(id,count*2);
	else updata2(id,count*2+1);
}
void updata(int count)
{
	updata2(count,1);
	if(mapp[count].l==mapp[count].r) return;
	int mid=(mapp[count].l+mapp[count].r)/2;
	if(h<=mid) updata(count*2);
	else updata(count*2+1);
}
double que2(int l,int r,int id,int count)
{
	//cout<<l<<"~"<<r<<endl;
	if(mapp[id].root[count].l==l&&mapp[id].root[count].r==r) return mapp[id].root[count].max;
	int mid=(mapp[id].root[count].l+mapp[id].root[count].r)/2;
	if(r<=mid) return que2(l,r,id,count*2);
	else if(l>=mid+1) return que2(l,r,id,count*2+1);
	else return max(que2(l,mid,id,count*2),que2(mid+1,r,id,count*2+1)); 
}
double que(int l,int r,int count)
{
	if(mapp[count].l==l&&mapp[count].r==r) return que2(a,b,count,1);
	int mid=(mapp[count].l+mapp[count].r)/2;
	if(r<=mid) return que(l,r,count*2);
	else if(l>=mid+1) return que(l,r,count*2+1);
	else return max(que(l,mid,count*2),que(mid+1,r,count*2+1)); 
}
int main()
{
	int n;
	while(cin>>n&&n)
	{
		build(100,200,0,1000,1);
		string cmd;
		for(int i=0;i<n;i++)
		{
			cin>>cmd;
			if(cmd=="I")
			{
				cin>>h>>a>>b;
				a*=10;
				updata(1);
			}
			else
			{
				cin>>h>>hh>>a>>b;
				if(h>hh) swap(h,hh);//坑 
				a*=10;b*=10;
				if(a>b) swap(a,b);//坑 
				if(que(h,hh,1)!=-1)printf("%.1f\n",que(h,hh,1));
				else cout<<"-1"<<endl;
			}
		}
	}
	return 0;
}

hdu 1823 Luck and Love

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原文地址：http://blog.csdn.net/zafkiel_nightmare/article/details/47612571