Submission #851162

#	Time	Username	Problem	Language	Result	Execution time	Memory
851162		pakapu	Cheap flights (LMIO18_pigus_skrydziai)	C++17	12 / 100	3052 ms	83724 KiB

pigus_skrydziai

#include <bits/stdc++.h>

using namespace std;

#define int long long

int ans = 0;

map<pair<int, int>, int> cost_of_pair;

vector<int> cost;
vector<int> calculated;
vector<vector<pair<int, int>>> g;

int dfs(int u, int depth) {
	if(depth >= 2) {
		return 0;
	}
	if(depth == 1) {
		for(auto v : calculated) {
			if(cost_of_pair.count(make_pair(u, v))) {
				//cout << v << ' ' << u << '\n';
				//cout << cost[v] << ' ' << cost[u] << ' ' << cost_of_pair[make_pair(u, v)] << '\n';
				ans = max(ans, cost[v] + cost[u] + cost_of_pair[make_pair(u, v)]);
			}
		}
		return 0;
	}

	int curr = 0;

	for(auto v : g[u]) {
		cost[v.first] = v.second;
		calculated.push_back(v.first);
		curr += v.second;
		dfs(v.first, depth + 1);
	}

	return curr;
}


signed main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);

	int n, m;
	cin >> n >> m;

	cost = vector<int>(n);
	g = vector<vector<pair<int, int>>>(n);

	for(int i = 0; i < m; i++) {
		int from, to, w;
		cin >> from >> to >> w;
		from--;
		to--;

		g[from].push_back(make_pair(to, w));
		g[to].push_back(make_pair(from, w));
		cost_of_pair[make_pair(from, to)] = w;
		cost_of_pair[make_pair(to, from)] = w;
	}

	ans = 0;
	for(int i = 0; i < n; i++) {
		int curr = dfs(i, 0);
		calculated.clear();
		ans = max(ans, curr);
	}


	cout << ans << '\n';

	return 0;
}

• Subtask 1: 12 / 12
• Subtask 2: 0 / 25
• Subtask 3: 0 / 16
• Subtask 4: 0 / 47