Submission #851159

#	Time	Username	Problem	Language	Result	Execution time	Memory
851159		pakapu	Cheap flights (LMIO18_pigus_skrydziai)	C++17	37 / 100	3043 ms	32196 KiB

pigus_skrydziai

#include <bits/stdc++.h>

using namespace std;

#define int long long

int ans = 0;

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

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

	int curr = 0;

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

	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);
	calculated = vector<int>(n, -1);
	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));
	}

	ans = 0;
	for(int i = 0; i < n; i++) {
		int curr = dfs(i, 0, i + 1);
		ans = max(ans, curr);
	}


	cout << ans << '\n';

	return 0;
}

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