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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
#416275#8720. BFS 序 0podysAC ✓262ms83096kbC++201.7kb2024-05-21 18:42:592024-05-21 18:43:00

Judging History

你现在查看的是最新测评结果

  • [2024-05-21 18:43:00]
  • 评测
  • 测评结果:AC
  • 用时:262ms
  • 内存:83096kb
  • [2024-05-21 18:42:59]
  • 提交

answer

#include<bits/stdc++.h>
using namespace std;
#define int long long
#define endl "\n"
int fa[300005][20],dep[300005],a[500005],in[300005];
vector<int> to[300005];
vector<int> test[300005];
set<int> node;
bool flag;
void dfs(int root,int f){
    dep[root]=dep[f]+1;
    for (int i=1;i<=19;i++) {
        fa[root][i] = fa[fa[root][i-1]][i-1];
    }
    for (auto x:to[root]) {
        if (x == f) continue;
        dfs(x, root);
    }
}
void lca(int x, int y) {
    for (int j = 19; j >= 0; j--) {
        if (fa[x][j] != fa[y][j]) {
            x = fa[x][j];
            y = fa[y][j];
        }
    }
    test[x].push_back(y);
    in[y]++;
    node.insert(x);node.insert(y);
}
bool solve(){
    flag=1;
    int n;
    cin>>n;
    
    for(int i=0;i<n;i++) cin>>a[i];
    for(int i=1;i<n;i++){
        if(a[i-1]==a[i]) flag=0;
        if(dep[a[i-1]]>dep[a[i]]) flag=0;
    }
    if(!flag) return 0;
    
    for(int i=1;i<n;i++){
        if(dep[a[i-1]]<dep[a[i]]) continue;
        lca(a[i-1],a[i]);
    }
    deque<int> que;
    
    for(auto x:node){
        if(!in[x]) que.push_back(x);
    }
    while(!que.empty()){
        int x = que.front();
        que.pop_front();
        for (auto y : test[x]) {
            in[y]--;
            if (!in[y]) que.push_back(y);
        }
    }
    for(auto x:node){
        if(in[x]) flag=0;
        in[x]=0;test[x].clear();
    }
    node.clear();
    return flag;
}
signed main(){
    ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    int n,q;
    cin>>n;
    for(int i=2;i<=n;i++){
        cin>>fa[i][0];
        to[fa[i][0]].push_back(i);
    }
    dfs(1,0);
    cin>>q;
    while(q--) cout<<(solve()?"Yes":"No")<<endl;
    return 0;
}

这程序好像有点Bug,我给组数据试试?

详细

Test #1:

score: 100
Accepted
time: 2ms
memory: 9860kb

input:

6
1 1 3 2 4
10
4 3 6 2 5
1 4
3 2 4 5
5 2 5 4 6 3
3 1 4 2
3 5 6 3
5 4 5 2 6 1
4 4 3 2 5
4 4 6 2 3
3 3 2 6

output:

No
Yes
Yes
No
No
No
No
No
No
Yes

result:

ok 10 token(s): yes count is 3, no count is 7

Test #2:

score: 0
Accepted
time: 262ms
memory: 82200kb

input:

300000
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1...

output:

No
Yes
Yes
Yes
No
No
No
No
No
No
Yes
Yes
No
Yes
No
Yes
Yes
Yes
No
No
No
No
Yes
No
No
Yes
No
No
No
No
Yes
Yes
Yes
No
No
Yes
No
No
No
No
No
No
No
Yes
No
Yes
No
Yes
No
No
No
No
Yes
Yes
Yes
No
No
Yes
No
No
No
No
No
Yes
Yes
No
No
No
No
No
Yes
Yes
No
Yes
No
No
No
Yes
No
No
Yes
No
No
Yes
Yes
Yes
No
No
No
Y...

result:

ok 254 token(s): yes count is 89, no count is 165

Test #3:

score: 0
Accepted
time: 261ms
memory: 82208kb

input:

300000
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1...

output:

Yes
No
No
Yes
No
No
Yes
Yes
No
Yes
No
Yes
No
No
No
Yes
No
No
No
No
Yes
No
No
No
No
No
Yes
Yes
No
No
No
Yes
No
No
No
No
No
Yes
Yes
Yes
No
No
No
No
No
No
No
Yes
No
Yes
No
No
No
Yes
No
No
No
Yes
No
No
Yes
No
Yes
Yes
No
No
No
Yes
No
Yes
Yes
Yes
No
Yes
No
Yes
Yes
Yes
Yes
Yes
No
Yes
No
No
No
No
No
Yes
No
...

result:

ok 266 token(s): yes count is 102, no count is 164

Test #4:

score: 0
Accepted
time: 254ms
memory: 83096kb

input:

300000
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1...

output:

No
No
Yes
No
Yes
No
No
No
No
No
No
No
No
Yes
No
No
No
No
No
No
No
No
Yes
No
No
No
No
Yes
No
No
No
No
No
No
No
Yes
Yes
No
No
No
No
No
No
Yes
No
No
No
Yes
Yes
No
No
No
Yes
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
No
Yes
No
No
No
No
No
No
No
Yes
Yes
No
Yes
No
No
No
No
No
No
Yes
Yes
No
Yes
Yes
No
No
No...

result:

ok 252 token(s): yes count is 87, no count is 165

Test #5:

score: 0
Accepted
time: 3ms
memory: 9904kb

input:

10
1 1 3 3 1 3 1 3 9
10000
4 3 5 6 9
5 3 1 4 9 6
5 6 4 3 5 7
28 8 3 4 3 1 6 3 5 8 7 2 4 4 4 2 7 5 9 2 4 10 8 4 10 3 4 5 7
3 5 2 9
6 4 7 2 3 9 5
5 9 2 5 6 1
12 3 5 8 8 1 3 5 8 4 5 9 1
29 3 9 9 1 5 8 5 5 6 10 8 8 4 8 4 2 8 10 5 7 3 7 1 8 4 7 5 1 6
7 5 9 8 3 2 1 6
4 4 1 9 5
22 10 9 5 4 5 8 10 3 2 1 10 ...

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
Yes
No
No
No
No
Yes
No
No
No
No
No
Yes
No
No
No
No
No
No
No
Yes
No
No
No
No
Yes
No
No
No
Yes
No
No
Yes
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
Yes
No
Yes
No
No
No
No
No
No
No
No
No
Yes
Yes
No
Yes
No
No
No
No
No
No
...

result:

ok 10000 token(s): yes count is 1058, no count is 8942

Test #6:

score: 0
Accepted
time: 5ms
memory: 9644kb

input:

9
1 2 1 2 2 4 2 6
10000
6 5 1 4 3 7 8
14 6 8 7 9 7 5 1 8 3 6 3 8 5 2
2 6 9
17 7 8 6 5 2 1 5 5 9 3 4 1 5 2 7 2 5
3 8 6 5
5 3 9 1 6 8
8 3 5 8 7 9 4 6 2
4 8 9 6 5
7 4 7 2 9 3 8 1
6 1 4 9 5 6 2
4 7 5 4 3
5 9 5 2 1 3
4 4 5 7 3
3 9 1 8
4 4 2 8 6
26 7 4 7 6 1 7 9 4 5 5 8 9 8 2 4 8 9 6 2 8 6 4 5 5 4 4
45 3 ...

output:

No
No
Yes
No
Yes
No
No
No
No
No
No
No
No
No
Yes
No
No
No
No
No
No
Yes
No
No
No
No
No
No
Yes
No
No
No
No
No
No
No
No
Yes
Yes
No
No
No
Yes
No
No
No
No
No
No
No
No
No
No
No
No
Yes
No
No
No
No
No
No
No
No
No
No
No
No
No
Yes
No
Yes
No
No
No
No
No
No
No
No
Yes
No
No
No
Yes
No
No
Yes
No
No
No
No
No
No
No
N...

result:

ok 10000 token(s): yes count is 1492, no count is 8508

Test #7:

score: 0
Accepted
time: 5ms
memory: 9828kb

input:

8
1 1 2 4 2 4 6
10000
5 2 6 6 2 1
3 7 3 8
2 8 1
5 7 5 1 2 7
3 2 3 5
3 8 4 3
5 8 2 4 5 3
4 3 2 1 8
6 6 8 4 5 3 1
6 3 1 2 7 4 6
4 8 6 4 3
5 4 7 6 8 5
11 2 1 6 5 2 7 1 3 3 5 4
4 6 1 7 2
7 6 2 7 8 4 1 3
3 4 6 7
3 7 1 6
38 3 4 6 6 3 4 8 1 5 3 1 8 8 6 2 3 6 7 8 8 4 2 3 7 3 3 6 7 7 5 7 5 8 8 5 4 5 7
1 8
5 ...

output:

No
No
No
No
Yes
No
No
No
No
No
No
No
No
No
No
Yes
No
No
Yes
No
No
No
No
No
Yes
No
Yes
No
No
No
Yes
Yes
No
No
No
No
No
No
Yes
No
No
No
No
No
No
No
No
No
No
No
Yes
No
No
No
No
No
No
No
No
No
Yes
No
No
No
No
No
No
No
No
No
No
No
No
No
No
Yes
No
No
No
No
No
No
No
No
No
No
No
No
No
No
Yes
No
No
No
No
No
...

result:

ok 10000 token(s): yes count is 1568, no count is 8432

Test #8:

score: 0
Accepted
time: 2ms
memory: 9608kb

input:

7
1 2 3 1 2 5
10000
5 1 7 3 5 6
5 5 3 2 7 4
4 5 2 6 4
12 3 1 5 5 6 6 3 5 3 5 3 3
11 2 3 2 6 7 3 6 6 3 3 3
2 3 2
6 1 3 4 2 6 7
3 2 7 1
6 5 2 7 3 4 1
27 2 5 6 1 7 1 7 1 4 6 7 1 6 2 1 7 1 3 4 4 7 7 2 6 4 4 3
2 5 6
1 7
3 3 1 4
4 1 7 3 4
3 4 2 1
4 4 1 6 7
4 6 2 7 4
4 5 1 6 4
1 3
5 1 2 3 5 7
5 2 3 7 6 5
1...

output:

No
No
Yes
No
No
No
No
No
No
No
Yes
Yes
No
Yes
No
No
No
No
Yes
No
No
No
No
Yes
No
No
Yes
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
Yes
No
No
Yes
No
Yes
Yes
No
Yes
Yes
No
No
No
No
No
No
No
No
No
No
Yes
No
No
No
No
No
No
No
No
Yes
No
Yes
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Ye...

result:

ok 10000 token(s): yes count is 2205, no count is 7795

Extra Test:

score: 0
Extra Test Passed