oj.uz

Submission #618095

# Submission time Handle Problem Language Result Execution time Memory
618095 2022-08-01T22:07:32 Z narvalo Inspection (POI11_ins) C++17
0 / 100
 1004 ms 71188 KB 
#include <bits/stdc++.h>

using namespace std;

int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  int n;
  cin >> n;
  if (n == 1) {
    cout << 0 << '\n';
    return 0;
  }
  vector<vector<int>> adj(n);
  for (int i = 0 ; i < n - 1 ; i += 1) {
    int a , b;
    cin >> a >> b;
    a -= 1 , b -= 1;
    adj[a].push_back(b);
    adj[b].push_back(a);
  }
  vector<pair<int , int>> dp(n);
  function<pair<int , int>(int , int)> Dfs = [&](int node , int pre) {
    int ans = 1;
    for (auto x : adj[node]) {
      if (x == pre) continue;
      ans += Dfs(x , node).first;
    }
    return dp[node] = make_pair(ans , pre);
  };
  Dfs(0 , -1);
  long long ans = 0;
  int max_depth = 0;
  function<void(int , int , int)> Get = [&](int node , int pre , int depth) {
    max_depth = max(depth , max_depth);
    ans += 1LL * depth * 2;
    for (auto x : adj[node]) {
      if (x == pre) continue;
      Get(x , node , depth + 1);
    }
    return ;
  };
  auto Init = [&]() {
    max_depth = 0;
    ans = 0;
    return ;
  };
  vector<int> sum(n);
  for (int i = 0 ; i < n ; i++) {
    for (auto x : adj[i]) {
      if (x == dp[i].second) continue;
      sum[i] += dp[x].first;
    }
  }
  for (int node = 0 ; node < n ; node += 1) {
    vector<int> comps;
    for (auto x : adj[node]) {
      int sz = (x == dp[node].second ? n - 1 - sum[node] : dp[x].first);
      comps.emplace_back(sz);
    }
    int mx = *max_element(comps.begin() , comps.end());
    if (mx > n - mx - 1 && n > 2) {
      cout << -1 << '\n';
      continue;     
    }
    else {
      Get(node , -1 , 0);
      cout << ans - max_depth << '\n';      
      Init(); 
    }
  }
  return 0; 
}

Subtask #1
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 212 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 340 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 340 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 9 ms 1748 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 17 ms 3060 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 54 ms 7340 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #7
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 492 ms 35532 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #8
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 999 ms 71188 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #9
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 1004 ms 71052 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #10
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 994 ms 70896 KB Output isn't correct
2 Halted 0 ms 0 KB -