Submission #516792

#	Time	Username	Problem	Language	Result	Execution time	Memory
516792		aurims	Cheap flights (LMIO18_pigus_skrydziai)	C++14	100 / 100	2799 ms	88992 KiB

pigus_skrydziai

#include <bits/stdc++.h>
#define debug cout << "alio\n"
#define pb push_back
#define ll long long
#define MAX (int)3e5
using namespace std;

vector<ll> adj[MAX];
map<pair<ll, ll>, ll> pe;

int main()
{
	cin.tie(NULL);
    ios_base::sync_with_stdio(false);
	int N, M;
	cin >> N >> M;
	for(int i = 0; i < M; i++)
	{
		ll a, b;
		ll p;
		cin >> a >> b >> p;
		adj[a-1].pb(b-1);
		adj[b-1].pb(a-1);
		pe[{a-1, b-1}] = p;
		pe[{b-1, a-1}] = p;
	}
	ll mx = -1;
	for(int i = 0; i < N; i++)
	{
		if(adj[i].empty())
			continue;
		ll sum_tr = 0;
		ll sum_zv = 0;
		// perrenkam zvaigzdes
		for(ll sidx : adj[i])
		{
			sum_zv += pe[{i, sidx}];
		}
		// perrenkam trikampius
		for(int j = 0; j < adj[i].size()-1; j++)
		{
			ll kaim1 = adj[i][j];
			ll kaim2 = adj[i][j+1];
			if(pe.find({kaim1, kaim2}) != pe.end()) // jeigu i-tojo miesto kaimynai j ir j+1 irgi turi kelia, tai susidaro trikampis
				sum_tr = pe[{kaim1, kaim2}] + pe[{i, kaim1}] + pe[{i, kaim2}];
		}
		if(sum_zv > mx) mx = sum_zv;
		if(sum_tr > mx) mx = sum_tr;
	}
	cout << mx << '\n';
}

Compilation message (stderr)

pigus_skrydziai.cpp: In function 'int main()':
pigus_skrydziai.cpp:40:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   40 |   for(int j = 0; j < adj[i].size()-1; j++)
      |                  ~~^~~~~~~~~~~~~~~~~

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