Submission #824738

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
824738	2023-08-14 09:18:39	tch1cherin	Village (BOI20_village)	C++17	56 / 100	105 ms	20144 KiB

Village

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#include <bits/stdc++.h>
using namespace std;
const int MAX_N = 1e5 + 5, MAX_L = __lg(MAX_N) + 1;
vector<int> G[MAX_N];
int up[MAX_L][MAX_N];
int depth[MAX_N];
vector<int> ord;
void DFS(int u, int p) {
  depth[u] = (u == 0 ? 0 : depth[p] + 1);
  ord.push_back(u);
  up[0][u] = p;
  for (int i = 1; i < MAX_L; i++) {
    up[i][u] = up[i - 1][up[i - 1][u]];
  }
  for (int v : G[u]) {
    if (v != p) {
      DFS(v, u);
    }
  }
}
int lca(int u, int v) {
  if (depth[u] < depth[v]) {
    swap(u, v);
  }
  for (int i = MAX_L - 1; i >= 0; i--) {
    if (depth[u] - depth[v] >= (1 << i)) {
      u = up[i][u];
 
 
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• Subtask 1: 12 / 12
• Subtask 2: 19 / 38
• Subtask 3: 25 / 50