Submission #503885

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
503885	2022-01-09 06:22:09	ac2hu	Railway (BOI17_railway)	C++14	100 / 100	120 ms	29624 KiB

railway

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#include <bits/stdc++.h>
using namespace std;
const int N = 1e5 + 10;
const int LG = log2(N) + 10;
vector<int> adj[N];
int n,m,k,l, timer = 0;
vector<pair<int,int>> edges;
int lca_util[N][LG];
int tin[N],tout[N];
int dist[N];
int ans[N];
void dfs(int i,int p){
  tin[i] = ++timer;
  lca_util[i][0] = p;
  for(int j = 1;j<=l;j++){
    lca_util[i][j] = lca_util[lca_util[i][j - 1]][j - 1];
  }
  for(int e : adj[i]){
    if(e != p){
      dfs(e,i);
    } 
  }
  tout[i] = ++timer;
}
bool is_ancestor(int i,int j){
  return (tin[i] <= tin[j] && tout[i] >= tin[j]);
}
int lca(int u, int v){
    if (is_ancestor(u, v))
        return u;
 
 
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Compilation message (stderr)

railway.cpp: In function 'int main()':
railway.cpp:71:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   71 |   for(int i = 0;i<vec.size();i++){
      |                 ~^~~~~~~~~~~

• Subtask 1: 8 / 8
• Subtask 2: 15 / 15
• Subtask 3: 7 / 7
• Subtask 4: 29 / 29
• Subtask 5: 16 / 16
• Subtask 6: 25 / 25