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Submission #469379

# Submission time Handle Problem Language Result Execution time Memory
469379 2021-08-31T16:45:39 Z ivan_tudor Mousetrap (CEOI17_mousetrap) C++14
100 / 100
 970 ms 162332 KB 
#include<bits/stdc++.h>
using namespace std;
const int N = 1e6 + 5;
int dp[N];
int h[N];
bool viz[N];
vector<int> gr[N];
int par[N];
void first_dfs(int nod, int dad){
  par[nod] = dad;
  h[nod] = 1 + h[dad];
  for(auto x:gr[nod]){
    if(x != dad)
      first_dfs(x, nod);
  }
}
void dfs(int nod, int dad){
  int nrvec = 0;
  for(auto x:gr[nod]){
    if(x == dad || viz[x] == true)
      continue;
    nrvec++;
    dfs(x, nod);
  }
  if(nrvec == 1){
    dp[nod] = 1;
    return;
  }
  int m1 = 0, m2 = 0;
  for(auto x:gr[nod]){
    if(x == dad || viz[x])
      continue;
    if(nrvec + dp[x] > m1){
      m2 = m1;
      m1 = nrvec +  dp[x];
    }
    else if(nrvec +  dp[x] > m2){
      m2 = nrvec +  dp[x];
    }
  }
  dp[nod] = m2;
}
vector<pair<int, int>> v;
int last;
int solve(int nod, int climbed){
  viz[nod] = true;
  if(par[nod] == 0)
    return 0;
  int sum = solve(par[nod], climbed + 1);
  sum += gr[nod].size() - (par[nod] != 0) - (nod != last);
  vector<int> vec;
  for(auto x:gr[nod]){
    if(viz[x] == false){
      dfs(x, nod);
      v.push_back({climbed + 1, dp[x] + sum});
    }
  }
  return sum;
}
bool check(int t){
  int lelm = -1, nrelm = 0;
  int erased = 0;
  for(auto x:v){
    int auxt = t;
    if(lelm == x.first){
      auxt += nrelm;
    }
    if(x.second > auxt){
      if(x.first <= erased)
        return false;
      if(t > 0){
        t--;
        erased++;
        if(lelm != x.first){
          lelm = x.first;
          nrelm = 1;
        }
        else if(lelm == x.first)
          nrelm++;
      }
      else
        return false;
    }
  }
  return true;
}
int main()
{
  //freopen(".in","r",stdin);
  ios::sync_with_stdio(false);
  cin.tie(0),cout.tie(0);
  int n, root, m;
  cin>>n>>root>>m;
  for(int i =1 ; i<n; i++){
    int x, y;
    cin>>x>>y;
    gr[x].push_back(y);
    gr[y].push_back(x);
  }
  first_dfs(root, 0);
  last = m;
  solve(m, 0);
  sort(v.begin(), v.end());
  int ans = 0;
  for(int pas = 1<<30; pas > 0; pas /=2 ){
    if(check(ans + pas) == false)
      ans+=pas;
  }
  if(check(ans) == false)
    ans++;
  cout<<ans;
  return 0;
}

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 13 ms 23724 KB Output is correct
2 Correct 13 ms 23756 KB Output is correct
3 Correct 13 ms 23756 KB Output is correct
4 Correct 15 ms 23828 KB Output is correct
5 Correct 13 ms 23756 KB Output is correct
6 Correct 13 ms 23812 KB Output is correct
7 Correct 13 ms 23820 KB Output is correct
8 Correct 13 ms 23816 KB Output is correct
9 Correct 13 ms 23816 KB Output is correct
10 Correct 15 ms 23760 KB Output is correct

Subtask #2
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 354 ms 66788 KB Output is correct
2 Correct 326 ms 62924 KB Output is correct
3 Correct 970 ms 68468 KB Output is correct
4 Correct 448 ms 46360 KB Output is correct
5 Correct 940 ms 68276 KB Output is correct
6 Correct 970 ms 68236 KB Output is correct

Subtask #3
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 13 ms 23724 KB Output is correct
2 Correct 13 ms 23756 KB Output is correct
3 Correct 13 ms 23756 KB Output is correct
4 Correct 15 ms 23828 KB Output is correct
5 Correct 13 ms 23756 KB Output is correct
6 Correct 13 ms 23812 KB Output is correct
7 Correct 13 ms 23820 KB Output is correct
8 Correct 13 ms 23816 KB Output is correct
9 Correct 13 ms 23816 KB Output is correct
10 Correct 15 ms 23760 KB Output is correct
11 Correct 14 ms 23820 KB Output is correct
12 Correct 14 ms 23864 KB Output is correct
13 Correct 13 ms 23848 KB Output is correct
14 Correct 15 ms 23884 KB Output is correct
15 Correct 15 ms 23952 KB Output is correct
16 Correct 15 ms 23820 KB Output is correct
17 Correct 14 ms 23756 KB Output is correct
18 Correct 14 ms 23812 KB Output is correct
19 Correct 14 ms 23884 KB Output is correct
20 Correct 14 ms 23812 KB Output is correct
21 Correct 14 ms 23884 KB Output is correct
22 Correct 14 ms 23756 KB Output is correct

Subtask #4
35.0 / 35.0

# Verdict Execution time Memory Grader output
1 Correct 13 ms 23724 KB Output is correct
2 Correct 13 ms 23756 KB Output is correct
3 Correct 13 ms 23756 KB Output is correct
4 Correct 15 ms 23828 KB Output is correct
5 Correct 13 ms 23756 KB Output is correct
6 Correct 13 ms 23812 KB Output is correct
7 Correct 13 ms 23820 KB Output is correct
8 Correct 13 ms 23816 KB Output is correct
9 Correct 13 ms 23816 KB Output is correct
10 Correct 15 ms 23760 KB Output is correct
11 Correct 354 ms 66788 KB Output is correct
12 Correct 326 ms 62924 KB Output is correct
13 Correct 970 ms 68468 KB Output is correct
14 Correct 448 ms 46360 KB Output is correct
15 Correct 940 ms 68276 KB Output is correct
16 Correct 970 ms 68236 KB Output is correct
17 Correct 14 ms 23820 KB Output is correct
18 Correct 14 ms 23864 KB Output is correct
19 Correct 13 ms 23848 KB Output is correct
20 Correct 15 ms 23884 KB Output is correct
21 Correct 15 ms 23952 KB Output is correct
22 Correct 15 ms 23820 KB Output is correct
23 Correct 14 ms 23756 KB Output is correct
24 Correct 14 ms 23812 KB Output is correct
25 Correct 14 ms 23884 KB Output is correct
26 Correct 14 ms 23812 KB Output is correct
27 Correct 14 ms 23884 KB Output is correct
28 Correct 14 ms 23756 KB Output is correct
29 Correct 14 ms 23712 KB Output is correct
30 Correct 367 ms 71212 KB Output is correct
31 Correct 352 ms 71360 KB Output is correct
32 Correct 422 ms 162332 KB Output is correct
33 Correct 416 ms 149632 KB Output is correct
34 Correct 967 ms 72460 KB Output is correct
35 Correct 953 ms 72428 KB Output is correct
36 Correct 934 ms 83612 KB Output is correct
37 Correct 937 ms 83636 KB Output is correct
38 Correct 758 ms 85388 KB Output is correct
39 Correct 721 ms 85388 KB Output is correct
40 Correct 772 ms 85248 KB Output is correct