Submission #617215

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
617215	2022-08-01 09:42:41	WLZ	One-Way Streets (CEOI17_oneway)	C++14	0 / 100	1 ms	468 KiB

oneway

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#include <bits/stdc++.h>
using namespace std;
/** 1-indexed LCA class */
class least_common_ancestor {
  private:
    int n, max_log, dfs_cnt = 1;
    vector< vector< pair<int, int> > > g;
    vector< vector<int> > up;
    vector<int> d, dfs_in, dfs_out;
    void dfs(int u, int p) {
      dfs_in[u] = dfs_cnt++;
      up[u][0] = p;
      for (int i = 1; i <= max_log; i++) up[u][i] = up[up[u][i - 1]][i - 1];
      for (auto &v : g[u]) {
        if (v.first == u) continue;
        d[v.first] = d[u] + v.second;
        dfs(v.first, u);
      }
      dfs_out[u] = dfs_cnt;
    }
    void init() {
      n = (int) g.size() - 1;
      max_log = ceil(log2(n + 1));
      up.assign(n + 1, vector<int>(max_log + 1));
      d.assign(n + 1, 0);
      dfs_in.resize(n + 1);
      dfs_out.resize(n + 1);
 
 
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• Subtask 1: 0 / 30
• Subtask 2: 0 / 30
• Subtask 3: 0 / 40