Submission #642588

#	Time	Username	Problem	Language	Result	Execution time	Memory
642588		andreast12	Paths (BOI18_paths)	C++17	23 / 100	3091 ms	9184 KiB

paths

#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define pb push_back
#define fi first
#define se second
const int mod=998244353, maxn=1e5+5;
int n, m, k, c[maxn], u, v, ans;
vector<int> adj[maxn];
bool vis[maxn];

void dfs(int now, int state, int jml) {
    if(!vis[now]&&(((1<<c[now])&state)==0)) {
        if(jml==1) {
            ans++;
        } else {
            vis[now]=true;
            for(auto nxt:adj[now]) {
                dfs(nxt, state|(1<<c[now]), jml-1);
            }
        }
        vis[now]=false;
    }
}

int main() {
    ios_base::sync_with_stdio(false); cin.tie(NULL);
    cin >> n >> m >> k;
    for(int i=1; i<=n; i++) cin >> c[i];
    while(m--) {
        cin >> u >> v;
        adj[u].pb(v);
        adj[v].pb(u);
    }
    for(int jml=2; jml<=k; jml++) {
        for(int i=1; i<=n; i++) {
            dfs(i, 0, jml);
        }
    }
    cout << ans << '\n';
}

• Subtask 1: 23 / 23
• Subtask 2: 0 / 20
• Subtask 3: 0 / 27
• Subtask 4: 0 / 30