Submission #124967

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
124967	2019-07-04 08:31:50	elabensaad	Duathlon (APIO18_duathlon)	C++14	23 / 100	1146 ms	1048580 KiB

count_triplets

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#include <bits/stdc++.h>
using namespace std;
long long n, m, x, y, vis[300000], ans;
vector <int> t[300000];
void DFS (int v){
  vis[v] = 1;
  for (auto i : t[v]){
    if (vis[i] == 0){DFS(i);vis[v] += vis[i];
    }
  }
}
void dfs (int v, int r, int p = 0){
  ans+=(vis[r]-vis[v])*(vis[v]-1)*2;
  for (auto i : t[v]){
    if (i != p){dfs(i, r, v);ans+=(vis[v]-vis[i]-1)*vis[i];}
  }
}
main() {
  cin >> n >> m;
  for(int i = 0;i < m;i++){
    cin >> x >> y;
    x--;
    y--;
    t[x].push_back(y);
    t[y].push_back(x);  
  }
 
 
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Compilation message (stderr)

count_triplets.cpp:22:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main() {
      ^

• Subtask 1: 0 / 5
• Subtask 2: 0 / 11
• Subtask 3: 0 / 8
• Subtask 4: 10 / 10
• Subtask 5: 13 / 13
• Subtask 6: 0 / 15
• Subtask 7: 0 / 20
• Subtask 8: 0 / 8
• Subtask 9: 0 / 10