Submission #107297

#	Time	Username	Problem	Language	Result	Execution time	Memory
107297		kuroni	Duathlon (APIO18_duathlon)	C++14	5 / 100	40 ms	640 KiB

count_triplets

#include <iostream>
#include <cstdio>
#include <vector>
#include <algorithm>
using namespace std;

const int N = 11;

int n, m, u, v;
long long ans = 0;
bool vis[N][1 << N];
vector<int> adj[N];

bool get_ans(int st, int mi, int en)
{
    for (int i = 0; i <= n; i++)
        for (int j = 0; j < (1 << n + 1); j++)
            vis[i][j] = false;
    vis[st][1 << st] = true;
    for (int msk = 0; msk < (1 << n + 1); msk++)
        for (int ls = 1; ls <= n; ls++)
            if (vis[ls][msk])
            {
                if (ls == en && (msk >> mi & 1))
                    return true;
                for (int &v : adj[ls])
                    if (!(msk >> v & 1))
                        vis[v][msk ^ (1 << v)] = true;
            }
    return false;
}

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    cin >> n >> m;
    while (m--)
    {
        cin >> u >> v;
        adj[u].push_back(v);
        adj[v].push_back(u);
    }
    for (int i = 1; i <= n; i++)
        for (int j = 1; j <= n; j++)
            for (int k = 1; k <= n; k++)
                if (i != j && i != k && j != k)
                    ans += get_ans(i, j, k);
    cout << ans;
}

Compilation message (stderr)

count_triplets.cpp: In function 'bool get_ans(int, int, int)':
count_triplets.cpp:17:37: warning: suggest parentheses around '+' inside '<<' [-Wparentheses]
         for (int j = 0; j < (1 << n + 1); j++)
                                   ~~^~~
count_triplets.cpp:20:37: warning: suggest parentheses around '+' inside '<<' [-Wparentheses]
     for (int msk = 0; msk < (1 << n + 1); msk++)
                                   ~~^~~

• Subtask 1: 5 / 5
• Subtask 2: 0 / 11
• Subtask 3: 0 / 8
• Subtask 4: 0 / 10
• Subtask 5: 0 / 13
• Subtask 6: 0 / 15
• Subtask 7: 0 / 20
• Subtask 8: 0 / 8
• Subtask 9: 0 / 10