文艺平衡树FHQ-Treap-指针版

文艺平衡树FHQ-Treap-指针版

文艺平衡树 FHQ-Treap-指针版 代码存档

AC-C++11 385ms 9.09MB

AC-C++11 O2 394ms 9.23MB

貌似这玩意厌氧啊

/**************************************************************
 * Problem: 3391(FHQ-Treap-pointer)
 * Author: Vanilla_chan
 * Date: 20210402
**************************************************************/
#include<iostream>
#include<algorithm>
#include<cstdio>
#include<cstring>
#include<cmath>
#include<map>
#include<set>
#include<queue>
#include<vector>
#include<limits.h>
#define IL inline
#define re register
#define LL long long
#define ULL unsigned long long
#ifdef TH
#define debug printf("Now is %d\n",__LINE__);
#else
#define debug 
#endif
#ifdef ONLINE_JUDGE
char buf[1<<23],* p1=buf,* p2=buf,obuf[1<<23],* O=obuf;
#define getchar() (p1==p2&&(p2=(p1=buf)+fread(buf,1,1<<21,stdin),p1==p2)?EOF:*p1++)
#endif
using namespace std;

template<class T>inline void read(T& x)
{
	char ch=getchar();
	int fu;
	while(!isdigit(ch)&&ch!='-') ch=getchar();
	if(ch=='-') fu=-1,ch=getchar();
	x=ch-'0';ch=getchar();
	while(isdigit(ch)) { x=x*10+ch-'0';ch=getchar(); }
	x*=fu;
}
inline int read()
{
	int x=0,fu=1;
	char ch=getchar();
	while(!isdigit(ch)&&ch!='-') ch=getchar();
	if(ch=='-') fu=-1,ch=getchar();
	x=ch-'0';ch=getchar();
	while(isdigit(ch)) { x=x*10+ch-'0';ch=getchar(); }
	return x*fu;
}
int G[55];
template<class T>inline void write(T x)
{
	int g=0;
	if(x<0) x=-x,putchar('-');
	do { G[++g]=x%10;x/=10; } while(x);
	for(int i=g;i>=1;--i)putchar('0'+G[i]);putchar('\n');
}
#define N 100010
struct Treap
{
	struct node
	{
		node *ls,*rs;
		int val,k,sze;
		bool flag;
		void upd()
		{
			sze=1;
			if(ls) sze+=ls->sze;
			if(rs) sze+=rs->sze;
		}
		node(int v)
		{
			ls=rs=0;
			val=v;
			sze=1;
			k=rand();
			upd();
		}
		void work()
		{
			flag^=1;
			swap(ls,rs);
		}
		void spread()
		{
			if(flag)
			{
				if(ls) ls->work();
				if(rs) rs->work();
				flag=0;
			}
		}
	}*root;
	node *merge(node *x,node *y)
	{
		if(!x) return y;
		if(!y) return x;
		if(x->k<y->k)
		{
			x->spread();
			x->rs=merge(x->rs,y);
			x->upd();
			return x;
		}
		else
		{
			y->spread();
			y->ls=merge(x,y->ls);
			y->upd();
			return y;
		}
	}
	int sss(node *x)
	{
		if(x) return x->sze;
		return 0;
	}
	void split(node *i,int k,node *&x,node *&y)
	{
		if(!i)
		{
			x=y=0;
			return;
		}
		i->spread();
		if(sss(i->ls)<k)
		{
			x=i;
			split(i->rs,k-sss(i->ls)-1,i->rs,y);
		}
		else
		{
			y=i;
			split(i->ls,k,x,i->ls);
		}
		i->upd();
	}
	void out(node *x)
	{
		x->spread();
		if(x->ls) out(x->ls);
		cout<<x->val<<" ";
		if(x->rs) out(x->rs);
	}
}tree;
Treap::node *a,*b,*c;
int n,m;
int main()
{
	n=read();
	m=read();
	for(int i=1;i<=n;i++)
	{
		tree.root=tree.merge(tree.root,new Treap::node(i));
	}
	for(int i=1,l,r;i<=m;i++)
	{
		l=read();
		r=read();
		tree.split(tree.root,l-1,a,b);
		tree.split(b,r-l+1,b,c);
		b->work();
		tree.root=tree.merge(a,tree.merge(b,c));
	}
	tree.out(tree.root);
	return 0;
}