Submission #1188344

#	Time	Username	Problem	Language	Result	Execution time	Memory
1188344		kl0989e	Paths (BOI18_paths)	C++20	100 / 100	230 ms	104452 KiB

paths

#include <bits/stdc++.h>
using namespace std;

#define ll long long
#define fi first
#define se second
#define pb push_back
#define vi vector<int>
#define vl vector<ll>
#define pi pair<int, int>
#define pl pair<ll,ll>
#define all(x) (x).begin(),(x).end()

const int maxn=3e5+10;

vector<vl> dp(maxn,vl(1<<5,0));
vi col(maxn);
vector<vi> graph(maxn);

int32_t main() {
	ios::sync_with_stdio(0);
	cin.tie(0);
	int n,m,k;
	cin >> n >> m >> k;
	for (int i=0; i<n; i++) {
		cin >> col[i];
		col[i]--;
		dp[i][1<<col[i]]=1;
	}
	int a,b;
	for (int i=0; i<m; i++) {
		cin >> a >> b;
		graph[--a].pb(--b);
		graph[b].pb(a);
	}
	ll ans=0;
	for (int msk=3; msk<(1<<k); msk++) {
		if (__builtin_popcount(msk)==1) {
			continue;
		}
		for (int i=0; i<n; i++) {
			if (!(msk&(1<<col[i]))) {
				continue;
			}
			for (auto to:graph[i]) {
				dp[i][msk]+=dp[to][msk^(1<<col[i])];
			}
			ans+=dp[i][msk];
		}
	}
	cout << ans << '\n';
	return 0;
}

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