fork download 
  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. int parad[1000003];
  4. vector<vector<int>> vec;
  5. int maxwyn=0;
  6. int max_dfs(int n)
  7. {
  8.     int maks1=0;
  9.     int maks2=0;
  10.     for(auto a:vec[n])
  11.     {
  12.         int xd=max_dfs(a);
  13.         if(maks1<=xd)
  14.         {
  15.             maks2=maks1;
  16.             maks1=xd;
  17.         }
  18.         else if(maks1>xd and xd>maks2)
  19.         {
  20.             maks2=xd;
  21.         }
  22.     }
  23.     int jajko = maks2+maks1-2+vec[n].size();
  24.     maxwyn=max(maxwyn, jajko );
  25.     return (maks1-2+vec[n].size());
  26. }
  27. int main()
  28. {
  29.     int n,k;cin>>n>>k;
  30.     vec.resize(n+1);
  31.     for(int i=0;i<n-1;i++)
  32.     {
  33.         int a,b;cin>>a>>b;
  34.         vec[a].push_back(b);
  35.         vec[b].push_back(a);
  36.     }
  37.     max_dfs(1);
  38.     cout<<maxwyn;
  39. }
Success #stdin #stdout 0s 5316KB
comments (?)
stdin 
8
1 2
2 3
4 2
5 2
6 5
5 7
7 8
stdout 
Standard output is empty
https://ideone.com/7iMoVb
language:
C++ (gcc 8.3)
created:
14 hours ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!