Submission #716434

#	Time	Username	Problem	Language	Result	Execution time	Memory
716434		KING	Paths (BOI18_paths)	C++14	100 / 100	324 ms	53360 KiB

paths

#include<bits/stdc++.h>
#define NOT_STONKS ios::sync_with_stdio(false), cin.tie(0), cout.tie(0)

using namespace std;
const int maxn = 3e5 + 10; //4e6 + 10; //3e5 + 10;
const int mod = 1e9 + 7; //998244353;
typedef long long ll;

ll n, m, k, c[maxn], dp[50][maxn];
vector<int> G[maxn];

int main() {
    NOT_STONKS;

    cin >> n >> m >> k;
    for (int i = 1; i <= n; i++) cin >> c[i], c[i]--;
    for (int i = 0; i < m; i++) {
        int u, v;
        cin >> u >> v;
        G[u].push_back(v);
        G[v].push_back(u);
    }

    for (int i = 1; i <= n; i++) dp[1 << c[i]][i] = 1;
    for (int mask = 1; mask < (1 << k); mask++)
        for (int i = 1; i <= n; i++) 
            for (int u : G[i]) 
                dp[mask][i] += dp[mask ^ (1 << c[i])][u];

    ll ans = 0;
    for (int mask = 0; mask < (1 << k); mask++) 
        for (int i = 1; i <= n; i++) if (__builtin_popcount(mask) > 1)
            ans += dp[mask][i];
    
    cout << ans << endl;
    return 0;
}

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