OJ-Problems-Source/HDOJ/5217_autoAC.cpp

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#include<stdio.h>
#include<string.h>
#include<algorithm>
using namespace std;
#define N 200010
char str[N];
struct Node
{
Node(int l=0,int r=0){lnum=l;rnum=r;}
int lnum,rnum;
}node[N<<2];
void pushup(int rt)
{
int matched=min(node[rt<<1].lnum,node[rt<<1|1].rnum);
node[rt].lnum=node[rt<<1].lnum+node[rt<<1|1].lnum-matched;
node[rt].rnum=node[rt<<1].rnum+node[rt<<1|1].rnum-matched;
}
void build(int l,int r,int rt)
{
if(l==r)
{
node[rt].lnum=node[rt].rnum=0;
if(str[l]=='(')node[rt].lnum=1;
else node[rt].rnum=1;
return ;
}
int mid=(l+r)/2;
build(l,mid,rt<<1);
build(mid+1,r,rt<<1|1);
pushup(rt);
}
Node query(int L,int R,int l,int r,int rt)
{
if(L<=l&&r<=R)
return node[rt];
int mid=(l+r)/2;
Node ret;
if(L<=mid)ret=query(L,R,l,mid,rt<<1);
if(R>mid)
{
Node tmp=query(L,R,mid+1,r,rt<<1|1);
int matched=min(ret.lnum,tmp.rnum);
ret.lnum+=tmp.lnum-matched;
ret.rnum+=tmp.rnum-matched;
}
return ret;
}
void change(int x,int l,int r,int rt)
{
if(l==r&&r==x)
{
swap(node[rt].lnum,node[rt].rnum);
return;
}
int mid=(l+r)/2;
if(x<=mid)change(x,l,mid,rt<<1);
else change(x,mid+1,r,rt<<1|1);
pushup(rt);
return;
}
int lsearch(int L,int R,int K,Node &Val,int l,int r,int rt)
{
if(L<=l&&r<=R)
{
int mid=(l+r)/2;
if(l==r)
{
int matched=min(Val.lnum,node[rt].rnum);
int lnum=Val.lnum+node[rt].lnum-matched;
int rnum=Val.rnum+node[rt].rnum-matched;
if(rnum==K)return l;
else
{
Val.lnum=lnum;
Val.rnum=rnum;
return 0;
}
}
int matched=min(Val.lnum,node[rt<<1].rnum);
int lnum=Val.lnum+node[rt<<1].lnum-matched;
int rnum=Val.rnum+node[rt<<1].rnum-matched;
if(K<=rnum)
{
return lsearch(L,R,K,Val,l,mid,rt<<1);
}
else
{
Val.lnum=lnum;
Val.rnum=rnum;
return lsearch(L,R,K,Val,mid+1,r,rt<<1|1);
}
}
int mid=(l+r)/2;
if(R<=mid)return lsearch(L,R,K,Val,l,mid,rt<<1);
if(L>mid)return lsearch(L,R,K,Val,mid+1,r,rt<<1|1);
int ret=lsearch(L,R,K,Val,l,mid,rt<<1);
if(ret)return ret;
else return lsearch(L,R,K,Val,mid+1,r,rt<<1|1);
}
int rsearch(int L,int R,int K,Node &Val,int l,int r,int rt)
{
if(L<=l&&r<=R)
{
int mid=(l+r)/2;
if(l==r)
{
int matched=min(Val.rnum,node[rt].lnum);
int lnum=Val.lnum+node[rt].lnum-matched;
int rnum=Val.rnum+node[rt].rnum-matched;
if(lnum==K)return l;
else
{
Val.lnum=lnum;
Val.rnum=rnum;
return 0;
}
}
int matched=min(Val.rnum,node[rt<<1|1].lnum);
int lnum=Val.lnum+node[rt<<1|1].lnum-matched;
int rnum=Val.rnum+node[rt<<1|1].rnum-matched;
if(K<=lnum)
{
return rsearch(L,R,K,Val,mid+1,r,rt<<1|1);
}
else
{
Val.lnum=lnum;
Val.rnum=rnum;
return rsearch(L,R,K,Val,l,mid,rt<<1);
}
}
int mid=(l+r)/2;
if(R<=mid)return rsearch(L,R,K,Val,l,mid,rt<<1);
if(L>mid)return rsearch(L,R,K,Val,mid+1,r,rt<<1|1);
int ret=rsearch(L,R,K,Val,mid+1,r,rt<<1|1);
if(ret)return ret;
else return rsearch(L,R,K,Val,l,mid,rt<<1);
}
int main()
{
int t;
scanf("%d",&t);
while(t--)
{
int n,q;
scanf("%d%d",&n,&q);
scanf(" %s",&str[1]);
int len=strlen(&str[1]);
build(1,len,1);
for(int i=0;i<q;i++)
{
int type;
scanf("%d",&type);
if(type==1)
{
int x;
scanf("%d",&x);
change(x,1,len,1);
}
else
{
int a,b,k;
scanf("%d%d%d",&a,&b,&k);
Node tp(0,0),qry=query(a,b,1,len,1);
int cnt=qry.lnum+qry.rnum;
if(cnt<k){printf("-1\n");continue;}
if(k<=qry.rnum)
{
printf("%d\n",lsearch(a,b,k,tp,1,len,1));
}
else
{
printf("%d\n",rsearch(a,b,cnt-k+1,tp,1,len,1));
}
}
}
}
}