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#410740#4000. Dynamic ReachabilityChrysanthBlossomML 1ms6240kbC++142.8kb2024-05-14 13:41:212024-05-14 13:41:22

Judging History

你现在查看的是最新测评结果

  • [2024-05-14 13:41:22]
  • 评测
  • 测评结果:ML
  • 用时:1ms
  • 内存:6240kb
  • [2024-05-14 13:41:21]
  • 提交

answer

#include<bits/stdc++.h> 
#include<string>
#define ri register int
#define ll long long
#define mkp make_pair
using namespace std;
const int maxn=5e4+7;
int n,m,q;
int cnt,head[maxn],to[maxn<<1],nxt[maxn<<1];
int d[maxn];
void add(int u,int v){
	++cnt;
	d[v]++;
	to[cnt]=v;
	nxt[cnt]=head[u];
	head[u]=cnt;
}
struct opt{
	int op,u,v;
	int id;
}qry[maxn<<1];
vector<pair<int,int> >edge;
const int B=32;
bool tongxing[maxn<<1];
int vis[maxn];
vector<int>pnt;
namespace Small_G{
	int ed[65][65];
	ll fr[65];
	void clear(){
		memset(ed,0,sizeof(ed));
		for(ri i=1;i<=64;i++){
			fr[i]=0;
		}
	}
	void change(int u,int v){
		ed[u][v]^=1;
	}
	int n;
	bool find(int u,int goal){
		if(u==goal)return 1;
		for(ri v=1;v<=n;v++){
			if(ed[u][v]){
				if(find(v,goal))return 1;
			}
		}
		return 0;
	}
	bool kd(int u,int v){
		return find(u,v);
	}
} 
struct my_queue{
	int num[maxn];
	int head,tail;
	void clear(){
		head=1,tail=0;
	}
	void push(int x){
		num[++tail]=x;
	} 
	void pop(){
		++head;
	}
	int front(){
		return num[head];
	}
	bool empty(){
		return tail<head;
	}
}qq;
ll kd[maxn];
void solve(int l,int r){
//	cout<<l<<' '<<r<<endl;
	for(ri i=l;i<=r;i++){
		vis[qry[i].u]=1;
		vis[qry[i].v]=1;
	}
	pnt.clear();
	for(ri i=1;i<=n;i++){
		if(vis[i])pnt.emplace_back(i);
	}
	for(ri i=0;i<pnt.size();i++){
		vis[pnt[i]]=i+1;
	}
	memset(nxt,0,sizeof(nxt));
	memset(head,0,sizeof(head));
	memset(d,0,sizeof(d));
	cnt=0;
	for(ri i=0;i<edge.size();i++){
		if(tongxing[i]){
			add(edge[i].first,edge[i].second);
		}
	}
	qq.clear();
	Small_G::clear();
	Small_G::n=pnt.size();
	for(ri i=1;i<=n;i++){
		if(d[i]==0){
			qq.push(i);
		}
	} 
	while(!qq.empty()){
		int u=qq.front();qq.pop();
		if(vis[u]){
			for(ri i=0;i<pnt.size();i++){
				if(kd[u]>>i&1){
					Small_G::change(i+1,vis[u]);
				}
			}
			kd[u]=1ll<<vis[u]-1;
		}
		for(ri e=head[u];e;e=nxt[e]){
			int v=to[e];
			kd[v]|=kd[u];
			d[v]--;
			if(d[v]==0){
				qq.push(v);
			}
		}
	}
	for(ri i=l;i<=r;i++){
		if(qry[i].op==1){
			Small_G::change(vis[qry[i].u],vis[qry[i].v]);
			tongxing[qry[i].id]^=1;
		} 
		else {
			cout<<(Small_G::kd(vis[qry[i].u],vis[qry[i].v])?"YES":"NO")<<endl;
		}
	}
	memset(vis,0,sizeof(vis));
}
signed main(){
	ios::sync_with_stdio(0);
	cin>>n>>m>>q;
	for(ri i=1;i<=m;i++){
		int u,v;
		cin>>u>>v;
//		add(u,v);
		edge.emplace_back(mkp(u,v));
	}
	memset(tongxing,1,sizeof(tongxing));
	for(ri i=1;i<=q;i++){
		cin>>qry[i].op;
		if(qry[i].op==1){
			cin>>qry[i].id;
			qry[i].id--;
			qry[i].u=edge[qry[i].id].first;
			qry[i].v=edge[qry[i].id].second;
		}
		else{
			cin>>qry[i].u>>qry[i].v;
		}
	}
	for(ri i=1;i<=q/B;i++){
		solve((i-1)*B+1,i*B);
	}
	if(q%B)solve(q/B*B+1,q);
	return 0;
}
/*
5 6 7
1 2
1 3
2 4
3 4
3 5
4 5
2 1 5
2 2 3
1 3
1 4
2 1 4
1 3
2 1 5
*/

详细

Test #1:

score: 100
Accepted
time: 1ms
memory: 6240kb

input:

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

output:

YES
NO
NO
YES

result:

ok 4 lines

Test #2:

score: -100
Memory Limit Exceeded

input:

50000 100000 100000
36671 44121
25592 44321
13226 46463
13060 25694
14021 20087
22881 38333
34655 47774
22868 26462
31154 48710
27491 32365
5874 47497
17622 28600
1886 14193
22315 23656
14973 22704
1335 25384
22612 34915
2852 48213
23334 25519
24342 28784
6238 36125
14598 39494
33069 34250
2123 3059...

output:

NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
...

result: