bzoj1251

作为我以后的模板吧

#include<cstdio>
#include<cctype>
#include<algorithm>
using namespace std;
const int maxn=150002;
int n,m,rt,w[maxn],tr[maxn][2],mx[maxn],siz[maxn],rev[maxn],tag[maxn],fa[maxn];
inline void read(int &x){
	char ch=getchar();x=0;int f=1;
	while(!isdigit(ch)){if(ch=='-')f=-1;ch=getchar();}
	while(isdigit(ch)){x=(x<<1)+(x<<3)+ch-'0';ch=getchar();}
	x*=f;
}
inline void pushup(int x){
	mx[x]=max(w[x],max(mx[tr[x][0]],mx[tr[x][1]]));
	siz[x]=1+siz[tr[x][0]]+siz[tr[x][1]];
}
void pushdown(int x){
    if(tag[x]){
		if(tr[x][0]){tag[tr[x][0]]+=tag[x];mx[tr[x][0]]+=tag[x];w[tr[x][0]]+=tag[x];}
		if(tr[x][1]){tag[tr[x][1]]+=tag[x];mx[tr[x][1]]+=tag[x];w[tr[x][1]]+=tag[x];}
		tag[x]=0;
    }
    if(rev[x]){
		rev[tr[x][0]]^=1;rev[tr[x][1]]^=1;
		swap(tr[x][0],tr[x][1]);
		rev[x]=0;
    }
}
void rotate(int x,int &wher){
    int old=fa[x],oldf=fa[old],whic=(tr[old][1]==x);
    if(old==wher)wher=x;else tr[oldf][tr[oldf][1]==old]=x;
    fa[x]=oldf;fa[old]=x;fa[tr[x][whic^1]]=old;
    tr[old][whic]=tr[x][whic^1];tr[x][whic^1]=old;
    pushup(old);pushup(x);
}
void splay(int x,int &wher){
    while(x!=wher){
		int old=fa[x],oldf=fa[old];
		if(old!=wher)rotate((tr[old][1]==x)==(tr[oldf][1]==old)?old:x,wher);
		rotate(x,wher);
    }
}
int find(int x,int rk){
	if(tag[x]||rev[x])pushdown(x);
	if(siz[tr[x][0]]+1==rk)return x;
	else if(siz[tr[x][0]]>=rk)return find(tr[x][0],rk);
	else return find(tr[x][1],rk-siz[tr[x][0]]-1);
}
void updataad(int l,int r,int ad){
	int ll=find(rt,l),rr=find(rt,r+2);
	splay(ll,rt);splay(rr,tr[ll][1]);
	int z=tr[rr][0];
	tag[z]+=ad;mx[z]+=ad;w[z]+=ad;
}
inline int query(int l,int r){
    int x=find(rt,l),y=find(rt,r+2);
    splay(x,rt);splay(y,tr[x][1]);
    return mx[tr[y][0]];
}
inline void updatarev(int l,int r)
{
    int x=find(rt,l),y=find(rt,r+2);
    splay(x,rt);splay(y,tr[x][1]);
    int z=tr[y][0];
    rev[z]^=1;
}
inline void build(int l,int r,int fath){
	if(l>r)return;
	if(l==r){siz[l]=1;tr[fath][l>fath]=l;mx[l]=w[l];fa[l]=fath;return;}
	int mid=l+r>>1;
	fa[mid]=fath;tr[fath][mid>fath]=mid;
	build(l,mid-1,mid);build(mid+1,r,mid);
	pushup(mid);
}
int main(){
    mx[0]=-2e9;
	read(n);read(m);
	build(1,n+2,0);rt=(n+3)>>1;
	while(m--){
		int opt,x,y,z;read(opt);read(x);read(y);
		switch(opt){
			case 1:read(z);updataad(x,y,z);break;
			case 2:updatarev(x,y);break;
			case 3:printf("%d\n",query(x,y));break;
		}
	}
	return 0;
}