Submission #395453

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
395453	2021-04-28 11:18:54	Nordway	Railway (BOI17_railway)	C++17	7 / 100	153 ms	24436 KiB

railway

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#include <bits/stdc++.h>
using namespace std;
const int N = 1e5 + 1;
vector <pair<int, int>> g[N];
int timer, tin[N], tout[N], up[N][18];
void dfs(int v, int p = 1) {
  tin[v] = ++timer;
  up[v][0] = p;
  for (int i = 1; i <= 17; i++) up[v][i] = up[up[v][i - 1]][i - 1];
  for (pair<int, int> to : g[v]) {
    if (to.first != p) {
      dfs(to.first, v);
    }
  }
  tout[v] = timer;
}
bool upper(int u, int v) {
  return tin[u] <= tin[v] && tout[u] >= tout[v];
}
int lca(int u, int v) {
  if (upper(u, v)) return u;
  if (upper(v, u)) return v;
  for (int i = 17; i >= 0; i--) {
 
 
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Compilation message (stderr)

railway.cpp: In function 'int main()':
railway.cpp:75:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   75 |   for (int j = 0; j < S.size() - 1; j++) {
      |                   ~~^~~~~~~~~~~~~~

• Subtask 1: 0 / 8
• Subtask 2: 0 / 15
• Subtask 3: 7 / 7
• Subtask 4: 0 / 29
• Subtask 5: 0 / 16
• Subtask 6: 0 / 25