Submission #1150303

#	Time	Username	Problem	Language	Result	Execution time	Memory
1150303		tnt	Paths (BOI18_paths)	C++20	100 / 100	370 ms	260420 KiB

paths

#include <bits/stdc++.h>
using namespace std;
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
//#pragma GCC optimize("Ofast,unroll-loops,fast-math,O3")

#define pb push_back                    
#define ll long long
#define int long long
//#define sort(all(v)) sort(v.begin(),v.end())

int mod = 1e9 + 7;
const int N = 5e5 + 100;
const int inf = 2e9;
vector <int> g[N];
int ans;
int dp[N][100];
signed main(){
    //freopen("shuffle.in", "r", stdin);
    //freopen("shuffle.out", "w", stdout);
    int n,m,k;
    cin >> n >> m >> k;
    int a[n + 1];
    for(int i = 1; i <= n; i++){
        cin >> a[i];
        a[i]--;
        dp[i][(1 << a[i])] = 1;
    }
    for(int i = 1; i <= m; i++){
        int u,v;
        cin >> u >> v;
        g[u].pb(v);
        g[v].pb(u);
    }
    for(int mask = 1; mask < (1 << k); mask++){
        for(int i = 1; i <= n; i++){
            if((mask >> a[i]  & 1) != 1) continue;
            for(int to : g[i]){
                if((mask >> a[to]  & 1) != 1){
                    dp[to][mask + (1 << a[to])] += dp[i][mask];
                }
            }
        }
    }
    for(int mask = 1; mask < (1 << k); mask++){
        for(int i = 1; i <= n; i++){
            if(__builtin_popcount(mask) != 1)ans += dp[i][mask];
        }
    }
    cout << ans;
}

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