hdu 4973 A simple simulation problem.---线段树

线段树

点值存 每个种类的个数，

维护 ：区间和sum，区间最大值max，

操作：区间乘2，点加值

查询：区间和，区间最大值

懒标记：lazy区间乘数（标记的是当前区间子区间的lazy，当前区间已经更新完成了）

pushup，pushdown

http://blog.youkuaiyun.com/xcszbdnl/article/details/38736915

#include<stdio.h>
#include<iostream>
#include<string.h>
#include<algorithm>
#include<math.h>
#include<queue>
using namespace std;
#define ll __int64
#define EP 1e-10
#define N 50050  

struct node 
{
	int l,r;
	ll sum,max,lazy;
}tree[4*N];

void pushup(int id)
{
	tree[id].max=max(tree[id<<1].max,tree[id<<1|1].max);
	tree[id].sum=tree[id<<1].sum+tree[id<<1|1].sum;
}
void pushdown(int id)
{
	if(tree[id].lazy>1)
	{
		tree[id<<1].sum*=tree[id].lazy;
		tree[id<<1|1].sum*=tree[id].lazy;
		tree[id<<1].max*=tree[id].lazy;
		tree[id<<1|1].max*=tree[id].lazy;
		tree[id<<1].lazy*=tree[id].lazy;
		tree[id<<1|1].lazy*=tree[id].lazy;
		tree[id].lazy=1;
	}
}
void build(int id,int x,int y)
{
	tree[id].l=x;
	tree[id].r=y;
	tree[id].lazy=1;
	if(x==y)
	{
		tree[id].sum=tree[id].max=1;
		return ;
	}
	int mid=(x+y)>>1;
	build(id<<1,x,mid);
	build(id<<1|1,mid+1,y);
	pushup(id);
}
void add(int id,int x,ll y)
{
	if(tree[id].l==tree[id].r && tree[id].l==x)
	{
		tree[id].sum+=y;
		tree[id].max+=y;
		return ;
	}
	pushdown(id);
	int mid=(tree[id].l+tree[id].r)>>1;
	if(x<=mid)
		add(id<<1,x,y);
	else
		add(id<<1|1,x,y);
	pushup(id);
}
ll querysum(int id,int x,int y)
{
	if(tree[id].l==x && tree[id].r==y)
	{
		return tree[id].sum;
	}
	pushdown(id);
	int mid=(tree[id].l+tree[id].r)>>1;
	if(y<=mid)
		return querysum(id<<1,x,y);
	else if(mid+1<=x)
		return querysum(id<<1|1,x,y);
	else return querysum(id<<1,x,mid)+querysum(id<<1|1,mid+1,y);
}
void cheng(int id,int x,int y)
{
	if(tree[id].l==x && tree[id].r==y)
	{
		tree[id].sum*=2;
		tree[id].max*=2;
		tree[id].lazy*=2;
		return ;
	}
	pushdown(id);
	int mid=(tree[id].l+tree[id].r)>>1;
	if(y<=mid)
		cheng(id<<1,x,y);
	else if(mid+1<=x)
		cheng(id<<1|1,x,y);
	else {
		cheng(id<<1,x,mid);
		cheng(id<<1|1,mid+1,y);
	}
	pushup(id);
}
ll querymax(int id,int x,int y)
{
	if(tree[id].l==x && tree[id].r==y)
		return tree[id].max;
	pushdown(id);
	int mid=(tree[id].l+tree[id].r)>>1;
	if(y<=mid)
		return querymax(id<<1,x,y);
	else if(mid+1<=x)
		return querymax(id<<1|1,x,y);
	else
		return max(querymax(id<<1,x,mid),querymax(id<<1|1,mid+1,y));
}
int find(int id,ll x)
{
	if(tree[id].l==tree[id].r)
		return tree[id].l;
	pushdown(id);
	if(x>tree[id<<1].sum)
		return find(id<<1|1,x-tree[id<<1].sum);
	else
		return find(id<<1,x);
}
int main()
{
	int t,n,m,i,j,k;
	int res=0;
	scanf("%d",&t);
	while(t--)
	{
		res++;
		scanf("%d%d",&n,&m);
		build(1,1,n);
		char op;
		ll a,b;
		printf("Case #%d:\n",res);
		while(m--)
		{
			scanf(" %c%I64d%I64d",&op,&a,&b);
			int l=find(1,a);
			int r=find(1,b);
			if(op=='D')
			{
				if(l==r)
				{
					add(1,l,b-a+1);
				}
				else
				{
					ll t1=querysum(1,1,l);
					ll t2=querysum(1,1,r-1);
					add(1,l,t1-a+1);
					add(1,r,b-t2);
					if(l+1<=r-1)
						cheng(1,l+1,r-1);
				}
			}
			else if(op=='Q')
			{
				ll mx;
				if(l==r)
					mx=b-a+1;
				else
				{
					ll t1=querysum(1,1,l);
					ll t2=querysum(1,1,r-1);
					mx=max(t1-a+1,b-t2);
					if(l+1<=r-1)
						mx=max(mx,querymax(1,l+1,r-1));
				}
				printf("%I64d\n",mx);
			}
		}
	}
}