Submission #1174475

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
1174475	2025-03-27 03:18:44	_ncng.nyr	Cat in a tree (BOI17_catinatree)	C++20	100 / 100	598 ms	50504 KiB

catinatree

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#include<bits/stdc++.h>
using namespace std;
const int N = 2e5 + 5;
int n, D, it;
int in[N], out[N], h[N];
int up[20][N];
vector<int> ad[N];
void init(int u, int p) {
  in[u] = ++it;
  if(u == 1) for(int i = 0; i <= 18; ++i) up[i][u] = u;
  else for(int i = 1; i <= 18; ++i) up[i][u] = up[i - 1][up[i - 1][u]];
  for(auto v : ad[u]) {
    if(v == p) continue;
    up[0][v] = u;
    h[v] = h[u] + 1;
    init(v, u);
  }
  out[u] = it;
}
int anc(int u, int v) {
  return (in[u] <= in[v] && out[v] <= out[u]);
}
int lca(int u, int v) {
 
 
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• Subtask 1: 11 / 11
• Subtask 2: 40 / 40
• Subtask 3: 49 / 49