Submission #677285

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
677285	2023-01-02 17:53:08	PositiveDelta	Jail (JOI22_jail)	C++17	21 / 100	79 ms	1080 KiB

jail

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#include <bits/stdc++.h>
using namespace std;
struct LCA {
  int n;
  vector<int> depth;
  vector<vector<int>> g, dp;
  void dfs(int u) {
    depth[u] = (u == 0 ? 0 : depth[dp[0][u]] + 1);
    for (int i = 0; i + 1 < 20; i++)
      dp[i + 1][u] = dp[i][dp[i][u]];
    for (int v : g[u])
      if (v != dp[0][u]) {
        dp[0][v] = u;
        dfs(v);
      }
  }
  LCA(vector<vector<int>> g) : g(g) {
    n = g.size();
    depth.resize(n);
    dp.assign(20, vector<int>(n, 0));
    dfs(0);
  }
  int lca(int u, int v) {
    if (depth[u] < depth[v])
      swap(u, v);
 
 
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