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IDProblemSubmitterResultTimeMemoryLanguageFile sizeSubmit timeJudge time
#616583#4212. Bracketsucup-team3659RE 0ms0kbC++171.3kb2024-10-06 08:36:372024-10-06 08:36:38

Judging History

你现在查看的是最新测评结果

  • [2024-10-06 08:36:38]
  • 评测
  • 测评结果:RE
  • 用时:0ms
  • 内存:0kb
  • [2024-10-06 08:36:37]
  • 提交

answer

#include<bits/stdc++.h>
using namespace std;
const int N=2e6+10;
int n,p[N],tr[N],lst[N],to[N],sb[N];
inline void No(){cout<<"(",exit(0);}
inline void add(int x,int y){for(;x<N;x+=x&-x)tr[x]+=y;}
inline int query(int x){int sum=0;for(;x;x-=x&-x)sum+=tr[x];return sum;}
int main()
{
	freopen("fate.in","r",stdin);
	freopen("fate.out","w",stdout);
	ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
	cin>>n;
	if(n&1)No();
	for(int i=1;i<=n*2;i++)
	{
		cin>>p[i];
		if(lst[p[i]])to[lst[p[i]]]=i;
		lst[p[i]]=i;
	}
	int sbsb=0;
	if(n<=2000)
	for(int i=1;i<=n*2;i++)
	{
		if(!to[i])continue;
		add(i,1),add(to[i],1);
		bool flag=1;
		for(int i=1;i<=n*2;i++)if(query(n*2)-query(i-1)>(n*2-i+1)/2)flag=0;
		if(!flag)add(i,-1),add(to[i],-1);
		else sb[i]=sb[to[i]]=1,sbsb++;//,cout<<"#"<<i<<" "<<to[i]<<endl;
		if(sbsb==n/2)break;
	} 
	else
	for(int i=1;i<=n*2;i++)
	{
		if(!to[i])continue;
		add(i,1),add(to[i],1);
		if((query(n*2)-query(i-1)>(n*2-i+1)/2)||(query(n*2)-query(to[i]-1)>(n*2-to[i]+1)/2))add(i,-1),add(to[i],-1);
		else sb[i]=sb[to[i]]=1,sbsb++;//,cout<<"#"<<i<<" "<<to[i]<<endl;
		if(sbsb==n/2)break;
	}
	int nw=0;
	for(int i=1;i<=n*2;i++)
	{
		if(sb[i])nw++;
		else
		{
			if(!nw)No();
			nw--;
		}
	}
	if(nw)No();
	for(int i=1;i<=n*2;i++)cout<<((sb[i])?'(':')');
	return 0;
}

Details

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Test #1:

score: 0
Dangerous Syscalls

input:

2
1 2 1 2

output:


result: