oj.uz

Submission #243654

# Submission time Handle Problem Language Result Execution time Memory
243654 2020-07-01T13:44:42 Z Kubin Friend (IOI14_friend) C++17
46 / 100
 165 ms 65540 KB 
#include <bits/stdc++.h>

using namespace std;

enum Protocol
{
    IAmYourFriend = 0,
    MyFriendsAreYourFriends = 1,
    WeAreYourFriends = 2
};

int findSample(int _n, int val[], int host[], int protocol[])
{
    size_t n = _n;

    vector<vector<size_t>> graph(n);
    auto conn = [&](size_t u, size_t v) {
        graph[u].push_back(v);
        graph[v].push_back(u);
    };

    uint mask = 0;
    for(size_t i = 1; i < n; i++)
    {
        mask |= 1<<protocol[i];
        if(protocol[i] == IAmYourFriend)
            conn(i, host[i]);
        else if(protocol[i] == MyFriendsAreYourFriends)
            for(auto u : graph[host[i]])
                conn(i, u);
        else if(protocol[i] == WeAreYourFriends)
        {
            for(auto u : graph[host[i]])
                conn(i, u);
            conn(i, host[i]);
        }
    }

    if(not mask or mask == (1<<MyFriendsAreYourFriends))
        return accumulate(val, val + n, 0);
    else if(mask == (1<<WeAreYourFriends))
        return *max_element(val, val + n);
    else if(mask == (1<<IAmYourFriend))
    {
        vector<array<int, 2>> Q(n);
        for(size_t u = n; u --> 0; )
        {
            Q[u] = {0, val[u]};
            for(auto v : graph[u]) if(u == 0 or (int)v != host[u])
            {
                Q[u][0] += max(Q[v][0], Q[v][1]);
                Q[u][1] += Q[v][0];
            }
        }
        return max(Q[0][0], Q[0][1]);
    }
    /*
    else if(mask == ((1<<IAmYourFriend) | (1<<MyFriendsAreYourFriends)))
    {
        // graph is bipartite
    }
    */
    else
    {
        int result = 0;
        for(size_t s = 0; s < (1u << n); s++)
        {
            int curr = 0;
            bool ok = true;
            for(size_t i = 0; i < n; i++) if(s & (1 << i))
            {
                curr += val[i];
                for(size_t j = 0; j < n; j++) if(s & (1 << j))
                    if(find(graph[i].begin(), graph[i].end(), j) != graph[i].end())
                        ok = false;
            }
            if(ok)
                result = max(result, curr);
        }
        return result;
    }
}

Subtask #1
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 384 KB Output is correct
2 Correct 4 ms 384 KB Output is correct
3 Correct 5 ms 384 KB Output is correct
4 Correct 5 ms 384 KB Output is correct
5 Correct 5 ms 384 KB Output is correct
6 Correct 5 ms 384 KB Output is correct
7 Correct 5 ms 384 KB Output is correct
8 Correct 5 ms 384 KB Output is correct
9 Correct 5 ms 384 KB Output is correct
10 Correct 5 ms 384 KB Output is correct
11 Correct 4 ms 384 KB Output is correct
12 Correct 4 ms 384 KB Output is correct
13 Correct 5 ms 256 KB Output is correct
14 Correct 5 ms 384 KB Output is correct
15 Correct 4 ms 384 KB Output is correct
16 Correct 5 ms 384 KB Output is correct
17 Correct 5 ms 384 KB Output is correct

Subtask #2
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 384 KB Output is correct
2 Correct 5 ms 384 KB Output is correct
3 Correct 5 ms 384 KB Output is correct
4 Correct 5 ms 384 KB Output is correct
5 Correct 5 ms 384 KB Output is correct
6 Correct 5 ms 384 KB Output is correct
7 Correct 5 ms 384 KB Output is correct
8 Correct 5 ms 384 KB Output is correct
9 Correct 5 ms 384 KB Output is correct
10 Correct 5 ms 384 KB Output is correct

Subtask #3
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 2048 KB Output is correct
2 Correct 15 ms 7936 KB Output is correct
3 Correct 5 ms 384 KB Output is correct
4 Correct 11 ms 5888 KB Output is correct
5 Correct 14 ms 7936 KB Output is correct
6 Correct 5 ms 384 KB Output is correct
7 Correct 6 ms 1408 KB Output is correct
8 Correct 7 ms 1920 KB Output is correct
9 Correct 5 ms 384 KB Output is correct
10 Correct 17 ms 8448 KB Output is correct

Subtask #4
19.0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 384 KB Output is correct
2 Correct 5 ms 384 KB Output is correct
3 Correct 5 ms 384 KB Output is correct
4 Correct 5 ms 384 KB Output is correct
5 Correct 5 ms 384 KB Output is correct
6 Correct 5 ms 384 KB Output is correct
7 Correct 5 ms 384 KB Output is correct
8 Correct 5 ms 384 KB Output is correct
9 Correct 5 ms 384 KB Output is correct
10 Correct 5 ms 384 KB Output is correct
11 Correct 5 ms 384 KB Output is correct
12 Correct 5 ms 384 KB Output is correct
13 Correct 5 ms 384 KB Output is correct
14 Correct 5 ms 384 KB Output is correct
15 Correct 5 ms 384 KB Output is correct

Subtask #5
0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 384 KB Output is correct
2 Correct 4 ms 384 KB Output is correct
3 Correct 4 ms 384 KB Output is correct
4 Correct 5 ms 384 KB Output is correct
5 Correct 5 ms 384 KB Output is correct
6 Correct 5 ms 256 KB Output is correct
7 Correct 4 ms 384 KB Output is correct
8 Correct 5 ms 384 KB Output is correct
9 Correct 5 ms 384 KB Output is correct
10 Correct 5 ms 384 KB Output is correct
11 Incorrect 5 ms 384 KB Output isn't correct
12 Halted 0 ms 0 KB -

Subtask #6
0 / 31.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 384 KB Output is correct
2 Correct 5 ms 384 KB Output is correct
3 Correct 5 ms 384 KB Output is correct
4 Correct 5 ms 384 KB Output is correct
5 Correct 5 ms 384 KB Output is correct
6 Correct 5 ms 384 KB Output is correct
7 Correct 5 ms 384 KB Output is correct
8 Correct 5 ms 384 KB Output is correct
9 Correct 5 ms 384 KB Output is correct
10 Correct 5 ms 384 KB Output is correct
11 Correct 5 ms 384 KB Output is correct
12 Runtime error 165 ms 65540 KB Execution killed with signal 9 (could be triggered by violating memory limits)
13 Halted 0 ms 0 KB -