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ID题目提交者结果用时内存语言文件大小提交时间测评时间
#454367#1256. Delete Two Vertices AgainKevin5307WA 2ms11836kbC++232.2kb2024-06-24 20:24:092024-06-24 20:24:09

Judging History

你现在查看的是最新测评结果

  • [2024-06-24 20:24:09]
  • 评测
  • 测评结果:WA
  • 用时:2ms
  • 内存:11836kb
  • [2024-06-24 20:24:09]
  • 提交

answer

//Author: Kevin
#include<bits/stdc++.h>
//#pragma GCC optimize("O2")
using namespace std;
#define ll long long
#define ull unsigned ll
#define pb emplace_back
#define mp make_pair
#define ALL(x) (x).begin(),(x).end()
#define rALL(x) (x).rbegin(),(x).rend()
#define srt(x) sort(ALL(x))
#define rev(x) reverse(ALL(x))
#define rsrt(x) sort(rALL(x))
#define sz(x) (int)(x.size())
#define inf 0x3f3f3f3f
#define pii pair<int,int>
#define lb(v,x) (int)(lower_bound(ALL(v),x)-v.begin())
#define ub(v,x) (int)(upper_bound(ALL(v),x)-v.begin())
#define uni(v) v.resize(unique(ALL(v))-v.begin())
#define longer __int128_t
void die(string S){puts(S.c_str());exit(0);}
int n,m;
int u[300300],v[300300];
vector<int> G[300300];
int fa[300300],siz[300300];
int ind[300300];
int ans[300300];
int deg[300300],cur[300300];
int cnt;
vector<pii> op;
int anc(int x)
{
	while(fa[x]!=x) x=fa[x];
	return x;
}
void join(int u,int v,int d)
{
	u=anc(u);
	v=anc(v);
	if(u==v) return ;
	if(siz[u]>siz[v]) swap(siz[u],siz[v]);
	siz[v]+=siz[u];
	fa[u]=v;
	cnt--;
	op.pb(u,d);
}
void check(int u,int d)
{
	cur[u]++;
	if(cur[u]==deg[u])
		for(auto v:G[u])
			if(cur[v]==deg[v])
				join(u,v,d);
}
void del(int d)
{
	while(sz(op)&&op.back().second)
	{
		int x=op.back().first;
		op.pop_back();
		siz[fa[x]]-=siz[x];
		fa[x]=x;
		cnt++;
	}
}
void solve(int l,int r,int d)
{
	if(l==r)
	{
		if(cnt==1) ans[ind[l]]=1;
		return ;
	}
	int mid=(l+r)/2;
	for(int i=l;i<=mid;i++)
	{
		check(u[i],d);
		check(v[i],d);
	}
	solve(mid+1,r,d+1);
	for(int i=l;i<=mid;i++)
	{
		cur[u[i]]--;
		cur[v[i]]--;
	}
	del(d);
	for(int i=mid+1;i<=r;i++)
	{
		check(u[i],d);
		check(v[i],d);
	}
	solve(l,mid,d+1);
	for(int i=mid+1;i<=r;i++)
	{
		cur[u[i]]--;
		cur[v[i]]--;
	}
	del(d);
}
int main()
{
	ios_base::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);
	cin>>n>>m;
	for(int i=1;i<=n;i++)
	{
		fa[i]=i;
		siz[i]=1;
	}
	for(int i=1;i<=m;i++)
		cin>>u[i]>>v[i];
	for(int i=1;i<=m;i++)
	{
		ind[i]=i;
		deg[u[i]]++;
		deg[v[i]]++;
		G[u[i]].pb(v[i]);
		G[v[i]].pb(u[i]);
	}
	cnt=n-2;
	solve(1,m,0);
	for(int i=1;i<=m;i++)
		cout<<ans[i];
	return 0;
}

详细

Test #1:

score: 100
Accepted
time: 0ms
memory: 11836kb

input:

4 4
1 2
2 3
3 1
4 1

output:

0101

result:

ok OK. Jury's and participant's answers coincide. We don't know if they are both correct or both wrong.

Test #2:

score: 0
Accepted
time: 2ms
memory: 11820kb

input:

3 3
1 2
2 3
3 1

output:

111

result:

ok OK. Jury's and participant's answers coincide. We don't know if they are both correct or both wrong.

Test #3:

score: 0
Accepted
time: 0ms
memory: 11780kb

input:

3 2
1 2
2 3

output:

11

result:

ok OK. Jury's and participant's answers coincide. We don't know if they are both correct or both wrong.

Test #4:

score: -100
Wrong Answer
time: 2ms
memory: 11732kb

input:

6 7
1 2
1 3
1 6
2 4
3 4
3 5
4 6

output:

1110011

result:

wrong answer Deleting vertices 1 and 3 makes graph disconnected, but participant claims otherwise.