Submission #476414

#	Time	Username	Problem	Language	Result	Execution time	Memory
476414		AdamGS	Paths (BOI18_paths)	C++14	100 / 100	996 ms	100432 KiB

paths

#include<bits/stdc++.h>
using namespace std;
typedef long double ld;
#define int long long
#define rep(a, b) for(int a = 0; a < (b); ++a)
#define st first
#define nd second
#define pb push_back
#define all(a) a.begin(), a.end()
const int LIM=3e5+7;
vector<int>V[LIM];
int T[LIM], dp[LIM][1<<5];
int32_t main() {
	ios_base::sync_with_stdio(0); cin.tie(0);
	int n, m, k;
	cin >> n >> m >> k;
	rep(i, n) {
		cin >> T[i]; --T[i];
		dp[i][1<<T[i]]=1;
	}
	rep(i, m) {
		int a, b;
		cin >> a >> b; --a; --b;
		V[a].pb(b);
		V[b].pb(a);
	}
	int ans=0;
	for(int i=1; i<(1<<k); ++i) {
		rep(j, n) {
			if(__builtin_popcount(i)>1) ans+=dp[j][i];
			for(auto l : V[j]) if(!(i&(1<<T[l]))) {
				dp[l][i+(1<<T[l])]+=dp[j][i];
			}
		}
	}
	cout << ans << '\n';
}

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