【jzoj3740】【TJOI2014】【电源插排】【线段树】
2019-07-13 23:38发布
生成海报
题目大意
解题思路
建一棵线段树,动态开点,维护size,最大空区间,左边右边起最大空区间,及其起始点。同时开hash维护所有人站在哪里。
code
#include<set>
#include
#include
#include
#include
#define LF double
#define LL long long
#define Min(a,b) ((ab)?a:b)
#define Fo(i,j,k) for(int i=j;i<=k;i++)
#define Fd(i,j,k) for(int i=j;i>=k;i--)
#define For(i,j) for(int i=Begin[j];i;i=Next[i])
using namespace std;
int const Mxn=1e5,Mxm=3*1e6;
int N,Q,Pon=1,H[Mxn+9],Pos[Mxn+9],Ans[Mxm+9],Lans[Mxm+9],Rans[Mxm+9],
Size[Mxm+9],Beg[Mxm+9],Beg2[Mxm+9],Son[Mxm+9][2];
int Hash(int X){
int Tmp=X%Mxn;
while(H[Tmp]&&(H[Tmp]!=X))Tmp=(Tmp+1==Mxn)?0:Tmp+1;
H[Tmp]=X;
return Tmp;
}
void Oper(int Now,int L,int R,int U,int V){
int Mid=(L+R)>>1;
if(L==R){
Size[Now]+=V;
Lans[Now]=Rans[Now]=Ans[Now]=V<0;
Beg[Now]=Beg2[Now]=L;
return;
}
if(U<=Mid){
Son[Now][0]=(Son[Now][0])?Son[Now][0]:++Pon;
Oper(Son[Now][0],L,Mid,U,V);
}else{
Son[Now][1]=(Son[Now][1])?Son[Now][1]:++Pon;
Oper(Son[Now][1],Mid+1,R,U,V);
}
if(!Son[Now][0])Ans[0]=Lans[0]=Rans[0]=Mid-L+1,Beg[0]=Beg2[0]=L;
if(!Son[Now][1])Ans[0]=Lans[0]=Rans[0]=R-Mid,Beg[0]=Beg2[0]=Mid+1;
int Tmp,Tmp2;
if(Ans[Son[Now][0]]>Ans[Son[Now][1]])
Tmp=Beg[Son[Now][0]],Tmp2=Ans[Son[Now][0]];
else Tmp=Beg[Son[Now][1]],Tmp2=Ans[Son[Now][1]];
if((Rans[Son[Now][0]]+Lans[Son[Now][1]]>Tmp2)||
((Rans[Son[Now][0]]+Lans[Son[Now][1]]==Tmp2)&&(Beg2[Son[Now][0]]>Tmp)))
Tmp=Beg2[Son[Now][0]],Tmp2=Rans[Son[Now][0]]+Lans[Son[Now][1]];
Beg[Now]=Tmp;Ans[Now]=Tmp2;
Lans[Now]=(Lans[Son[Now][0]]==(Mid-L+1))?Mid-L+1+Lans[Son[Now][1]]:
Lans[Son[Now][0]];
if((Rans[Son[Now][1]]==R-Mid)&&Rans[Son[Now][0]]){
Rans[Now]=R-Mid+Rans[Son[Now][0]];
Beg2[Now]=Beg2[Son[Now][0]];
}else{
Rans[Now]=Rans[Son[Now][1]];
Beg2[Now]=Beg2[Son[Now][1]];
}
Size[Now]=Size[Son[Now][0]]+Size[Son[Now][1]];
Ans[0]=Lans[0]=Rans[0]=0;
}
int Qury(int Now,int L,int R,int U,int V){
int Mid=(L+R)>>1;
if((L==U)&&(R==V))return Size[Now];
if(V<=Mid)return (Son[Now][0])?Qury(Son[Now][0],L,Mid,U,V):0;
else if(MidNow][1])?Qury(Son[Now][1],Mid+1,R,U,V):0;
else return ((Son[Now][0])?Qury(Son[Now][0],L,Mid,U,Mid):0)+
((Son[Now][1])?Qury(Son[Now][1],Mid+1,R,Mid+1,V):0);
}
int main(){
freopen("switch.in","r",stdin);
freopen("switch.out","w",stdout);
scanf("%d%d",&N,&Q);
Beg[1]=1;Ans[1]=N;
Fo(cas,1,Q){
int K;scanf("%d",&K);
if(K){
int Tmp=Hash(K);
if(Pos[Tmp]){
Oper(1,1,N,Pos[Tmp],-1);
Pos[Tmp]=0;
continue;
}
Pos[Tmp]=Beg[1]+Ans[1]/2;
Oper(1,1,N,Pos[Tmp],1);
int bb;
bb++;
}else{
int L,R;scanf("%d%d",&L,&R);
printf("%d
",Qury(1,1,N,L,R));
}
}
return 0;
}
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