Submission #624975

#	Time	Username	Problem	Language	Result	Execution time	Memory
624975		Hanksburger	Paths (BOI18_paths)	C++17	100 / 100	329 ms	59960 KiB

paths

#include <bits/stdc++.h>
using namespace std;
long long dp[32][300005], a[300005];
vector<long long> adj[300005];
int main()
{
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    long long n, m, p, ans=0;
    cin >> n >> m >> p;
    for (long long i=1; i<=n; i++)
    {
        cin >> a[i];
        dp[1<<(--a[i])][i]=1;
    }
    for (long long i=1; i<=m; i++)
    {
        long long u, v;
        cin >> u >> v;
        adj[u].push_back(v);
        adj[v].push_back(u);
    }
    for (long long i=1; i<(1<<p); i++)
    {
        for (long long j=1; j<=n; j++)
        {
            if (i&(1<<a[j]))
                for (long long k:adj[j])
                    dp[i][j]+=dp[i^(1<<a[j])][k];
            ans+=dp[i][j];
        }
    }
    cout << ans-n;
    return 0;
}

• Subtask 1: 23 / 23
• Subtask 2: 20 / 20
• Subtask 3: 27 / 27
• Subtask 4: 30 / 30