Submission #230894

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
230894	2020-05-11 23:18:53	eohomegrownapps	Railway (BOI17_railway)	C++14	100 / 100	241 ms	45048 KiB

railway

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#include <bits/stdc++.h>
using namespace std;
 
vector<vector<pair<int,int>>> adjlist;
vector<int> depth;
vector<set<int>*> sets;
vector<vector<int>> nadd;
vector<vector<int>> nremove;
vector<int> ans;
int pk[100000][20];
int n,k;
 
void dfs(int node, int parent){
  for (auto p : adjlist[node]){
    if (p.first==parent){continue;}
    int i=p.first;
    pk[i][0]=node;
    depth[i]=depth[node]+1;
    dfs(i,node);
  }
}
 
void decom2k(){
  for (int i = 1; i<20; i++){
    for (int j = 0; j<n; j++){
      if (pk[j][i-1]!=-1){
        pk[j][i]=pk[pk[j][i-1]][i-1];
      }
    }
  }
 
 
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• Subtask 1: 8 / 8
• Subtask 2: 15 / 15
• Subtask 3: 7 / 7
• Subtask 4: 29 / 29
• Subtask 5: 16 / 16
• Subtask 6: 25 / 25