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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. const long long MaxN = 1e5 + 5;
  4. long long n, dp[MaxN];
  5. vector<long long> a[MaxN];
  6. void dfs(long long u, long long par)
  7. {
  8.     for (long long v : a[u])
  9.     {
  10.         if(v==par) continue;
  11.         dfs(v,u);
  12.         dp[u]+=dp[v];
  13.     }
  14. }
  15. void input()
  16. {
  17.     cin >> n;
  18.     for (long long i=1; i<n ;i++)
  19.     {
  20.         long long u,v;
  21.         cin >> u >> v;
  22.         a[u].push_back(v);
  23.         a[v].push_back(u);
  24.     }
  25. }
  26. void solve()
  27. {
  28.     for (long long i=1; i<=n ;i++)
  29.     {
  30.         dp[i]=1;
  31.     }
  32.     dfs(1,-1);
  33. }
  34. int main()
  35. {
  36.     ios_base::sync_with_stdio(0);
  37.     cin.tie(0);
  38.     input();
  39.     solve();
  40. }
  41.  
Success #stdin #stdout 0.01s 6056KB
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https://ideone.com/3ezDfh
language:
C++14 (gcc 8.3)
created:
1 day ago
visibility:
public

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