This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
#define debug cout << "alio\n";
#define pb push_back
#define ll long long
#define MAXN 5000
#define ff first
#define ss second
using namespace std;
/*
input
5 4
1 2 1
1 3 2
1 4 1
2 4 1
*/
struct miestas
{
vector<int> kaimynai;
vector<ll> pelnas;
};
vector<miestas> miestai;
int main()
{
int N, M;
cin >> N >> M;
miestai.resize(N);
for(int i = 0; i < N; i++)
{
miestai[i].pelnas.resize(N);
for(int j = 0; j < N; j++)
{
miestai[i].pelnas[j] = -1;
}
}
for(int i = 0; i < M; i++)
{
int a, b;
ll p;
cin >> a >> b >> p;
miestai[a-1].kaimynai.pb(b-1);
miestai[b-1].kaimynai.pb(a-1);
miestai[a-1].pelnas[b-1] = p;
miestai[b-1].pelnas[a-1] = p;
}
int mx = -1;
// perrenkam visas zvaigzdes
for(int i = 0; i < N; i++)
{
int sum = 0;
for(int sidx : miestai[i].kaimynai)
{
sum += miestai[i].pelnas[sidx];
}
if(sum > mx)
mx = sum;
}
// perrenkam visus trikampius
for(int i = 0; i < N; i++)
{
int sum = 0;
int mxind_1 = 0;
int mxind_2 = 0;
for(int sidx : miestai[i].kaimynai)
{
if(miestai[i].pelnas[sidx] > miestai[i].pelnas[mxind_1])
{
mxind_1 = sidx;
}
else if(miestai[i].pelnas[sidx] > miestai[i].pelnas[mxind_2])
{
mxind_2 = sidx;
}
}
if(miestai[mxind_1].pelnas[mxind_2] != -1)
sum += miestai[mxind_1].pelnas[mxind_2] + miestai[i].pelnas[mxind_1] + miestai[i].pelnas[mxind_2];
if(sum > mx)
mx = sum;
}
cout << mx << '\n';
}
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