Submission #489809

#	Time	Username	Problem	Language	Result	Execution time	Memory
489809		keta_tsimakuridze	Cities (BOI16_cities)	C++14	100 / 100	5678 ms	47028 KiB

cities

#include<bits/stdc++.h>
#define f first
#define s second
#define pii pair<int,int>
#define int long long
using namespace std;
const int N = 2e5 + 5, mod = 1e9 + 7, inf = 1e16; // !
int t,n,m,dp[N][35],k;
priority_queue<pii, vector<pii>, greater<pii> > q;
vector<pii> V[N];
main() {
	cin >> n >> k >> m;
	for(int i = 1; i <= n; i++) for(int j = 1; j < (1 << k); j++) dp[i][j] = inf;
	
	for(int i = 1; i <= k; i++) {
		int b;
		cin >> b;
		dp[b][1 << (i - 1)] = 0;
	}
	for(int i = 1; i <= m; i++) {
		int u,v,w;
		cin >> u >> v >> w;
		V[u].push_back({v,w});
		V[v].push_back({u,w});
	}
	
	for(int j = 1; j < (1 << k); j++) {
		vector<int> sub;
		for(int m = j; ; m = (m - 1) & j) {
			sub.push_back(m);
			if(!m) break;
		}
		for(int i = 0; i < sub.size(); i++) {
			int a = sub[i];
			for(int u = 1; u <= n; u++) {
				for(int id = 0; id < V[u].size(); id++) {
					dp[u][j] = min(dp[u][j], dp[V[u][id].f][sub[i]] + V[u][id].s + dp[u][sub[i] ^ j]);
				}
			}
		}
		for(int i = 1; i <= n; i++) q.push({dp[i][j], i});
		while(q.size()) {
			int d = q.top().f;
			int u = q.top().s;
			q.pop();
			if(d > dp[u][j]) continue;
			for(int i = 0; i < V[u].size(); i++) {
				if(dp[V[u][i].f][j] > dp[u][j] + V[u][i].s) {
					dp[V[u][i].f][j] = dp[u][j] + V[u][i].s;
					q.push({dp[V[u][i].f][j], V[u][i].f});
				}
			}
		}
	}
	int ans = inf;
	for(int i = 1; i <= n; i++) {
		ans = min(ans, dp[i][(1 << k) - 1]);
	}
	cout << ans;
}

Compilation message (stderr)

cities.cpp:11:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   11 | main() {
      | ^~~~
cities.cpp: In function 'int main()':
cities.cpp:33:20: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   33 |   for(int i = 0; i < sub.size(); i++) {
      |                  ~~^~~~~~~~~~~~
cities.cpp:36:24: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   36 |     for(int id = 0; id < V[u].size(); id++) {
      |                     ~~~^~~~~~~~~~~~~
cities.cpp:34:8: warning: unused variable 'a' [-Wunused-variable]
   34 |    int a = sub[i];
      |        ^
cities.cpp:47:21: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   47 |    for(int i = 0; i < V[u].size(); i++) {
      |                   ~~^~~~~~~~~~~~~

• Subtask 1: 22 / 22
• Subtask 2: 14 / 14
• Subtask 3: 15 / 15
• Subtask 4: 23 / 23
• Subtask 5: 26 / 26