QOJ.ac

QOJ

IDProblemSubmitterResultTimeMemoryLanguageFile sizeSubmit timeJudge time
#602890#8720. BFS 序 0UESTC_DECAYALI#AC ✓225ms59820kbC++202.7kb2024-10-01 13:21:362024-10-01 13:21:36

Judging History

你现在查看的是最新测评结果

  • [2024-10-01 13:21:36]
  • 评测
  • 测评结果:AC
  • 用时:225ms
  • 内存:59820kb
  • [2024-10-01 13:21:36]
  • 提交

answer

#include <bits/stdc++.h>

std::vector <int> G[300005];
int deg[300005];

void work() {
    int n; std::cin >> n;
    std::vector<int> pa(n, 0);
    std::vector<std::vector<int>> ch(n), loop(n);
    std::vector<int> dfn(n), dep(n);
    for(int i = 1; i < n; ++i) std::cin >> pa[i], pa[i]--, ch[pa[i]].emplace_back(i);

    int O = 0;
    auto dfs = [&](auto dfs, int cur) -> void {
        dfn[cur] = O++;
        loop[cur].emplace_back(pa[cur]);
        while(loop[cur].back() != 0) {
            if(loop[loop[cur].back()].size() < loop[cur].size()) break;
            loop[cur].emplace_back(loop[loop[cur].back()][loop[cur].size() - 1]);
        }
        for(auto ch: ch[cur]) dep[ch] = dep[cur] + 1, dfs(dfs, ch);
    };

    auto lca = [&](int a, int b) -> int {
        if(dep[a] < dep[b]) std::swap(a, b);
        for(int i = 20; ~i; --i) if((dep[a] - dep[b]) & (1 << i)) a = loop[a][i];
        if(a == b) return a;
        for(int i = 20; ~i; --i) if(loop[a].size() > i && loop[a][i] != loop[b][i])
            a = loop[a][i], b = loop[b][i];
        return loop[a][0];
    };

    auto jump = [&](int &x, int step) {
        assert(dep[x] >= step);
        for (int i=20;i>=0;--i) if ((step>>i)&1) x=loop[x][i];
    };

    dep[0] = 0;
    dfs(dfs, 0);
    // std::cerr << loop[9][0] << " " << loop[9][1] << char(10);
    // std::cerr << lca(10, 9) << char(10);
    // return ;

    int q; std::cin >> q;

    auto query = [&]() -> bool {
        int m; std::cin >> m;
        std::vector<int> b(m);
        for(auto &b: b) std::cin >> b, b--;
        std::vector <int> ext;
        for (int i=0;i+1<m;++i)
        if (dep[b[i+1]]<dep[b[i]]||b[i]==b[i+1]) return false;
        for (int i=0;i+1<m;++i)
        {
            int x=b[i],y=b[i+1];
            if (dep[x]!=dep[y]) continue;
            int z=lca(x,y);
            // printf("(%d %d %d)\n",x,y,z);
            jump(x,dep[x]-dep[z]-1); jump(y,dep[y]-dep[z]-1);
            ext.push_back(x); ext.push_back(y);
            G[x].push_back(y); ++deg[y];
        }
        std::sort(ext.begin(),ext.end());
        ext.erase(std::unique(ext.begin(),ext.end()),ext.end());
        std::queue <int> Q; int cnt=0;
        for (auto x:ext) if (!deg[x]) Q.push(x),++cnt;
        while (!Q.empty())
        {
            int now=Q.front(); Q.pop();
            for (auto to:G[now])
            if (!--deg[to]) Q.push(to),++cnt;
        }
        for (auto x:ext) G[x].clear(),deg[x]=0;
        return cnt==(int)ext.size();
    };

    while(q--) std::cout << (query() ? "Yes\n" : "No\n");
    return ;
}

int main() {
    // freopen("H.in","r",stdin);
    std::ios::sync_with_stdio(false);
    int T = 1; while(T--) work();
    return 0;
}

这程序好像有点Bug,我给组数据试试?

Details

Tip: Click on the bar to expand more detailed information

Test #1:

score: 100
Accepted
time: 1ms
memory: 3832kb

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: 222ms
memory: 59004kb

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
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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: 225ms
memory: 59564kb

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: 220ms
memory: 59820kb

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
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Yes
Yes
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Yes
Yes
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Yes
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Yes
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Yes
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Yes
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Yes
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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: 17ms
memory: 3832kb

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: 12ms
memory: 3556kb

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
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No
Yes
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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: 8ms
memory: 3544kb

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: 4ms
memory: 3564kb

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