QOJ.ac

QOJ

IDProblemSubmitterResultTimeMemoryLanguageFile sizeSubmit timeJudge time
#115120#3501. Jailst202308510 0ms0kbC++143.3kb2023-06-24 17:07:552023-06-24 17:07:56

Judging History

你现在查看的是最新测评结果

  • [2023-08-10 23:21:45]
  • System Update: QOJ starts to keep a history of the judgings of all the submissions.
  • [2023-06-24 17:07:56]
  • 评测
  • 测评结果:0
  • 用时:0ms
  • 内存:0kb
  • [2023-06-24 17:07:55]
  • 提交

answer

#include<bits/stdc++.h>
#define rep(i,a,b) for(int i=(a);i<=(b);i++)
using namespace std;
const int N=5e6+9;
int Q,n,m,deg[N],dfn[N],tot,son[N],sz[N],top[N],fa[N],d[N],rt1,rt2,id1[N],id2[N],cnt;
vector<int> e[N],t[N];

  int ls[N<<1],rs[N<<1],id=1;
void add(int x,int y) {deg[y]++, e[x].push_back(y);}

void prework(){
	rep(i,1,n) dfn[i]=sz[i]=fa[i]=top[i]=d[i]=son[i]=0,t[i].clear();
  rep(i,1,cnt) deg[i]=0, e[i].clear(); tot=0, cnt=0;
  rep(i,1,id) ls[i]=rs[i]=0; rt1=rt2=0;
    rep(i,1,n) id1[i]=id2[i]=0; id=1;
}


void builds(int &p,int l,int r){
    p=++id;
    if(l==r){
		id1[l]=p; 
		return ;
	} 
	int mid=(l+r)>>1;
    builds(ls[p],l,mid);
	builds(rs[p],mid+1,r);
    add(ls[p],p);
	add(rs[p],p);
}
void buildt(int &p,int l,int r){
    p=++id;
    if(l==r){
		id2[l]=p; 
		return ;
	} 
	int mid=(l+r)>>1;
    buildt(ls[p],l,mid);
	buildt(rs[p],mid+1,r);
    add(p,ls[p]);
	add(p,rs[p]);
}
void add1(int p,int l,int r,int L,int R,int c){
    assert(L);
    if(l==L&&r==R){	
		add(p,c); 
		return ;
	} 
	int mid=(l+r)>>1;
    if(R<=mid) add1(ls[p],l,mid,L,R,c);
    else if(L>mid) add1(rs[p],mid+1,r,L,R,c);
    else add1(ls[p],l,mid,L,mid,c),add1(rs[p],mid+1,r,mid+1,R,c);
}
void add2(int p,int l,int r,int L,int R,int c){
    if(l==L&&r==R){
		add(c,p); 
		return ;
	} 
	int mid=(l+r)>>1;
    if(R<=mid) add2(ls[p],l,mid,L,R,c);
    else if(L>mid) add2(rs[p],mid+1,r,L,R,c);
    else add2(ls[p],l,mid,L,mid,c),add2(rs[p],mid+1,r,mid+1,R,c);
}
void dfs1(int u) {
  d[u]=d[fa[u]]+1, sz[u]=1;
  for(int v:t[u]) if(v!=fa[u]) {
    fa[v]=u, dfs1(v), sz[u]+=sz[v];
    if(sz[v]>sz[son[u]]) son[u]=v;
  }
}
void dfs2(int u,int tp) {
  dfn[u]=++tot;
  top[u]=tp; if(son[u]) dfs2(son[u],tp);
  for(int v:t[u]) if(v!=fa[u]&&v!=son[u]) dfs2(v,v);
}
void work(int u,int v,int c) {
  if(d[u]<d[v]) swap(u,v);
  if(dfn[v]<=dfn[u]&&dfn[u]<dfn[v]+sz[v]) {
    u=fa[u];
    for(;top[u]!=top[v];u=fa[top[u]]) {
      add1(rt1,1,n,dfn[top[u]],dfn[u],c);
      add2(rt2,1,n,dfn[top[u]],dfn[u],c);
    }
    add1(rt1,1,n,dfn[v]+1,dfn[u],c);
    add2(rt2,1,n,dfn[v]+1,dfn[u],c);
  } else {
    u=fa[u], v=fa[v];
    for(;top[u]!=top[v];u=fa[top[u]]) {
      if(d[top[u]]<d[top[v]]) swap(u,v);
      add1(rt1,1,n,dfn[top[u]],dfn[u],c);
      add2(rt2,1,n,dfn[top[u]],dfn[u],c);
    }
    if(dfn[u]<dfn[v]) swap(u,v);
    add1(rt1,1,n,dfn[v],dfn[u],c);
    add2(rt2,1,n,dfn[v],dfn[u],c);
  }
}
bool topo(){//拓扑排序 
  	queue<int>q; 
  	for(int i=1;i<=cnt;i++){
  		if(!deg[i]) q.push(i);
  	}
  	while(!q.empty()){
    	int x=q.front();q.pop();
    	for(int y:e[x]){
			if(!(--deg[y])) q.push(y);
		} 
  	}
  	for(int i=1;i<=cnt;i++){
  		if(deg[i]) return 0;
  	}
  	return 1;
}
signed main() {
	ios::sync_with_stdio(false);
  cin.tie(0),cout.tie(0);
  cin>>Q; 
  while(Q--) {
    cin>>n; prework();
    rep(i,2,n) {
      int u, v;
      cin>>u>>v;
      t[u].push_back(v), t[v].push_back(u);
    }
    dfs1(1), dfs2(1,1);
    builds(rt1,1,n);
    buildt(rt2,1,n);
    cnt=id;
    cin>>m;
    rep(i,1,m) {
      int s, t; ++cnt;
      cin>>s>>t;
      add(id2[dfn[t]],cnt);
      add(cnt,id1[dfn[s]]);
      add(cnt,id2[dfn[s]]);
      add(id1[dfn[t]],cnt);
      work(s,t,cnt);
    }
    puts(topo()?"Yes":"No");
  }
  return 0;
}

Details

Tip: Click on the bar to expand more detailed information

Subtask #1:

score: 0
Time Limit Exceeded

Test #1:

score: 0
Time Limit Exceeded

input:

1
2
1 2
2
1 2
2 1

output:


result:


Subtask #2:

score: 0
Time Limit Exceeded

Test #21:

score: 0
Time Limit Exceeded

input:

20
250
1 15
15 16
16 17
17 18
18 19
19 20
20 21
21 22
22 23
3 23
1 24
24 25
25 26
5 26
1 27
27 28
28 29
29 30
30 31
31 32
32 33
33 34
34 35
35 36
36 37
37 38
38 39
39 40
40 41
41 42
7 42
2 43
43 44
44 45
45 46
4 46
2 47
47 48
48 49
49 50
50 51
51 52
52 53
53 54
54 55
12 55
2 56
56 57
57 58
58 59
59 ...

output:


result:


Subtask #3:

score: 0
Skipped

Dependency #2:

0%

Subtask #4:

score: 0
Skipped

Dependency #3:

0%

Subtask #5:

score: 0
Skipped

Dependency #4:

0%

Subtask #6:

score: 0
Time Limit Exceeded

Test #66:

score: 0
Time Limit Exceeded

input:

1000
10
1 2
2 3
1 4
4 5
4 6
4 7
2 8
8 9
3 10
2
5 4
1 9
10
1 2
1 3
1 4
4 5
4 6
3 7
3 8
2 9
6 10
2
2 9
1 5
10
1 2
2 3
1 4
4 5
4 6
2 7
3 8
2 9
1 10
2
10 2
7 5
10
1 2
1 3
1 4
2 5
1 6
3 7
2 8
7 9
2 10
2
10 5
2 7
10
1 2
1 3
1 4
3 5
5 6
3 7
7 8
1 9
8 10
2
6 7
1 2
10
1 2
1 3
3 4
2 5
4 6
3 7
1 8
4 9
1 10
2
1...

output:


result:


Subtask #7:

score: 0
Skipped

Dependency #1:

0%