Submission #529996

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
529996	2022-02-24 10:27:23	Alex_tz307	Railway (BOI17_railway)	C++17	100 / 100	91 ms	25660 KiB

railway

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#include <bits/stdc++.h>
using namespace std;
const int kN = 1e5;
const int kLog = 16;
int timer, tin[1 + kN], tout[1 + kN], depth[1 + kN], edge[1 + kN], dp[1 + kN], lg2[1 + kN], anc[1 + kN][1 + kLog];
vector<pair<int, int>> g[1 + kN];
void precalc() {
  for (int i = 2; i < kN; ++i) {
    lg2[i] = lg2[i / 2] + 1;
  }
}
void dfs1(int u) {
  tin[u] = ++timer;
  for (int i = 1; i <= kLog; ++i) {
    anc[u][i] = anc[anc[u][i - 1]][i - 1];
    if (anc[u][i] == 0) {
      break;
    }
  }
  for (auto it : g[u]) {
    int v, index;
    tie(v, index) = it;
    if (v != anc[u][0]) {
      anc[v][0] = u;
      depth[v] = depth[u] + 1;
      edge[v] = index;
 
 
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• Subtask 3: 7 / 7
• Subtask 4: 29 / 29
• Subtask 5: 16 / 16
• Subtask 6: 25 / 25