Submission #1145783

#	Time	Username	Problem	Language	Result	Execution time	Memory
1145783		imarn	Cheap flights (LMIO18_pigus_skrydziai)	C++20	0 / 100	856 ms	63852 KiB

pigus_skrydziai

#include<bits/stdc++.h>
#pragma GCC optimize("O3")
#pragma GCC target("avx2")
#define ll long long
#define pii pair<int,int>
#define pll pair<ll,ll>
#define plx pair<ll,int>
#define f first
#define s second
#define pb push_back
#define all(x) x.begin(),x.end()
#define vi vector<int>
#define vvi vector<vi>
#define pp pair<ll,int>
#define ub(x,i) upper_bound(all(x),i)-x.begin()
#define lb(x,i) lower_bound(all(x),i)-x.begin()
#define t3 tuple<int,int,int>
using namespace std;
const int mxn=3e5+5,k=710;
vector<pii>g[mxn];
ll dp[mxn]{0},ans=0;
bool vis[mxn]{0};
map<pair<int,int>,ll>mp;
vector<int>con[mxn];
void dfs(int u,int p){
    vis[u]=1;
    for(auto [v,w]:g[u]){
        if(v==p)continue;
        if(!vis[v])dfs(v,u);
        if(mp.find({p,v})!=mp.end())con[u].pb(v);
        for(auto x:con[v]){
            ans=max(ans,mp[{v,u}]+mp[{v,x}]+mp[{u,x}]);
        }
    }
}
int main(){
    ios_base::sync_with_stdio(0);cin.tie(0);
    int n,m;cin>>n>>m;
    for(int i=1;i<=m;i++){
        int a,b,c;cin>>a>>b>>c;
        g[a].pb({b,c});
        g[b].pb({a,c});
        dp[a]+=c;dp[b]+=c;
        mp[{a,b}]=mp[{b,a}]=c;
        ans=max({ans,dp[a],dp[b]});
    }dfs(1,-1);cout<<ans;
}

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