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QOJ

IDProblemSubmitterResultTimeMemoryLanguageFile sizeSubmit timeJudge time
#300739#4896. Alice、Bob 与 DFSzyc0704195 25ms16852kbC++143.5kb2024-01-08 18:20:122024-01-08 18:20:12

Judging History

你现在查看的是最新测评结果

  • [2024-01-08 18:20:12]
  • 评测
  • 测评结果:5
  • 用时:25ms
  • 内存:16852kb
  • [2024-01-08 18:20:12]
  • 提交

answer

#include <bits/stdc++.h>
using namespace std;
const int N = 2e5 + 3;

inline int read() {
    char ch = getchar(); int x = 0;
    while (!isdigit(ch)) {ch = getchar();}
    while (isdigit(ch)) {x = x * 10 + ch - 48; ch = getchar();}
    return x;
}

int n, c[N];
vector<int> g[N], vec;

namespace subtask1 {
    bool dp[N], ans;
    
    bool check() {
        for (int i = 1; i <= n; ++i)
            if (c[i] == 1) return false;
        return true;
    }

    void solve() {
        for (int x = n; x >= 1; --x) {
            dp[x] = 1;
            for (auto y : g[x]) dp[x] ^= dp[y];
        }
        for (auto r : vec) ans ^= dp[r];
        puts(ans ? "Alice" : "Bob");
    }
}

namespace subtask2 {
    int dp[N];

    bool check() {return vec.size() == 1;}

    void solve() {
        for (int x = n; x >= 1; --x) {
            if (g[x].empty()) dp[x] = 1;
            else {
                if (c[x] == 0) {
                    int val = 1;
                    for (auto y : g[x]) {
                        if (dp[y] <= 1) val ^= dp[y];
                        else {
                            val ^= dp[y];
                            break;
                        }
                    }
                    dp[x] = val;
                }else {

                }
            }
        }
        puts((dp[vec[0]] == 1 || dp[vec[0]] == 2) ? "Alice" : "Bob");
    }
}

namespace subtask3 {
    int cnt, val[N], sg[2000];
    vector<int> now, to[2000], tmp;
    vector< vector<int> > tot;
    
    bool check() {
        int m = 0;
        for (int x = 1; x <= n; ++x) m += g[x].size();
        return (n <= 10 && m <= 10);
    }

    void dfs(int x) {
        now.push_back(x);
        tot.push_back(now);
        for (auto y : g[x]) dfs(y);
        now.pop_back();
    }

    void solve() {
        for (int x = 1; x <= n; ++x) {
            tot.clear(); dfs(x); tot.push_back(now);
            for (int i = 0; i < tot.size(); ++i) to[i].clear();
            for (int i = 0; i < tot.size(); ++i) {
                if (tot[i].empty() || c[tot[i].back()] == 0) continue;
                for (int j = i + 1; j < tot.size(); ++j) {
                    if (tot[j].size() <= tot[i].size()) to[i].push_back(j);
                    if (tot[j].size() == tot[i].size() + 1 && tot[j][tot[i].size() - 1] == tot[i].back()) 
                        to[i].push_back(j);
                }
            }
            for (int i = tot.size() - 1; i >= 0; --i) {
                tmp.clear();
                for (auto j : to[i]) tmp.push_back(sg[j]);
                sort(tmp.begin(), tmp.end());
                int ans = 0;
                while (ans < tmp.size() && ans == tmp[ans]) ans++;
                sg[i] = ans;
                // if (x == 1) printf("[%d]\n", sg[i]);
            }
            val[x] = sg[0];
        }
        int fin = 0;
        for (auto x : vec) fin ^= val[x];
        puts(fin ? "Alice" : "Bob");
    }
}

int main() {
    n = read();
    for (int i = 1; i <= n; ++i) c[i] = read();
    for (int x = 1, m, y; x <= n; ++x) {
        m = read();
        while (m--) {
            y = read();
            g[x].push_back(y);
        }
    }
    int k = read(), x;
    while (k--) x = read(), vec.push_back(x);
    
    // subtask3 :: solve(); exit(0);
    
    if (subtask1 :: check()) subtask1 :: solve();
    else if (subtask2 :: check()) subtask2 :: solve();
    else if (subtask3 :: check()) subtask3 :: solve();
}

Details

Tip: Click on the bar to expand more detailed information

Subtask #1:

score: 5
Accepted

Test #1:

score: 5
Accepted
time: 2ms
memory: 8392kb

input:

1000
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0...

output:

Alice

result:

ok "Alice"

Test #2:

score: 0
Accepted
time: 0ms
memory: 9552kb

input:

1000
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0...

output:

Bob

result:

ok "Bob"

Test #3:

score: 0
Accepted
time: 0ms
memory: 9708kb

input:

1000
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0...

output:

Alice

result:

ok "Alice"

Test #4:

score: 0
Accepted
time: 2ms
memory: 8716kb

input:

10
0 0 0 0 0 0 0 0 0 0
1 2
1 3
1 4
1 5
1 6
1 7
1 8
1 9
1 10
0
1
1

output:

Bob

result:

ok "Bob"

Test #5:

score: 0
Accepted
time: 0ms
memory: 8336kb

input:

11
0 0 0 0 0 0 0 0 0 0 0
1 2
1 3
1 4
1 5
1 6
1 7
1 8
1 9
1 10
0
0
2
1 11

output:

Alice

result:

ok "Alice"

Test #6:

score: 0
Accepted
time: 3ms
memory: 16844kb

input:

200000
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0...

output:

Bob

result:

ok "Bob"

Test #7:

score: 0
Accepted
time: 11ms
memory: 16852kb

input:

200000
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0...

output:

Bob

result:

ok "Bob"

Test #8:

score: 0
Accepted
time: 24ms
memory: 15392kb

input:

200000
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0...

output:

Alice

result:

ok "Alice"

Test #9:

score: 0
Accepted
time: 25ms
memory: 15604kb

input:

200000
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0...

output:

Bob

result:

ok "Bob"

Test #10:

score: 0
Accepted
time: 14ms
memory: 16060kb

input:

200000
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0...

output:

Bob

result:

ok "Bob"

Test #11:

score: 0
Accepted
time: 22ms
memory: 13344kb

input:

200000
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0...

output:

Bob

result:

ok "Bob"

Test #12:

score: 0
Accepted
time: 19ms
memory: 14240kb

input:

200000
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0...

output:

Bob

result:

ok "Bob"

Test #13:

score: 0
Accepted
time: 18ms
memory: 13784kb

input:

200000
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0...

output:

Alice

result:

ok "Alice"

Test #14:

score: 0
Accepted
time: 15ms
memory: 13864kb

input:

200000
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0...

output:

Bob

result:

ok "Bob"

Test #15:

score: 0
Accepted
time: 2ms
memory: 9800kb

input:

1
0
0
1
1

output:

Alice

result:

ok "Alice"

Test #16:

score: 0
Accepted
time: 2ms
memory: 9616kb

input:

3
0 0 0
1 2
1 3
0
1
1

output:

Alice

result:

ok "Alice"

Test #17:

score: 0
Accepted
time: 2ms
memory: 9520kb

input:

4
0 0 0 0
1 2
1 3
0
0
2
1 4

output:

Bob

result:

ok "Bob"

Subtask #2:

score: 0
Wrong Answer

Test #18:

score: 0
Wrong Answer
time: 0ms
memory: 8840kb

input:

7
0 0 1 1 0 1 1
1 2
2 3 4
0
2 5 6
0
1 7
0
1
1

output:

Alice

result:

wrong answer 1st words differ - expected: 'Bob', found: 'Alice'

Subtask #3:

score: 0
Wrong Answer

Test #55:

score: 0
Wrong Answer
time: 2ms
memory: 9956kb

input:

7
0 0 1 1 0 1 1
1 2
2 3 4
0
2 5 6
0
1 7
0
1
1

output:

Alice

result:

wrong answer 1st words differ - expected: 'Bob', found: 'Alice'

Subtask #4:

score: 0
Wrong Answer

Test #103:

score: 0
Wrong Answer
time: 2ms
memory: 8724kb

input:

10
1 1 1 1 1 1 1 1 1 1
1 2
4 3 5 7 8
1 4
0
1 6
0
0
1 9
1 10
0
1
1

output:

Bob

result:

wrong answer 1st words differ - expected: 'Alice', found: 'Bob'

Subtask #5:

score: 0
Skipped

Dependency #4:

0%

Subtask #6:

score: 0
Skipped

Dependency #1:

100%
Accepted

Dependency #2:

0%