Submission #1046348

#	Time	Username	Problem	Language	Result	Execution time	Memory
1046348		xnqs	Cheap flights (LMIO18_pigus_skrydziai)	C++17	28 / 100	3070 ms	53336 KiB

pigus_skrydziai

#include <iostream>
#include <fstream>
#include <vector>
#include <queue>
#include <utility>
#include <algorithm>
#include <set>
 
int gs, edg;
std::vector<std::set<std::pair<int,int>>> adj_list;
std::vector<std::tuple<int,int,int>> edges;

int main() {
	std::ios_base::sync_with_stdio(false);
	std::cin.tie(NULL);
	std::cout.tie(NULL);
 
	std::cin >> gs >> edg;
	adj_list.resize(gs+1);
 
	for (int i = 0, a, b, c; i < edg; i++) {
		std::cin >> a >> b >> c;
		adj_list[a].emplace(b,c);
		adj_list[b].emplace(a,c);
		edges.emplace_back(a,b,c);
	}
 
	// try all star graphs
	int64_t ans = 0;
	for (int i = 1; i <= gs; i++) {
		int64_t cand = 0;
		for (const auto& [j, w] : adj_list[i]) {
			cand += w;
		}
		ans = std::max(ans,cand);
	}
 
	// try all "triangle" cycles
	for (const auto& [a, b, c] : edges) {
		int x = a;
		int y = b;
		
		if (adj_list[x].size()>adj_list[y].size()) {
			std::swap(x,y);
		}

		for (const auto& [i, w] : adj_list[x]) {
			auto it = adj_list[y].lower_bound(std::pair<int,int>(i,0));
			if (it!=adj_list[y].end()&&it->first==i) {
				ans = std::max(ans,(int64_t)c+w+it->second);
			}
		}
	}
 
	std::cout << ans << "\n";
}

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