Submission #271935

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
271935	2020-08-18 08:02:05	WLZ	Regions (IOI09_regions)	C++14	75 / 100	8106 ms	112488 KiB

regions

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#include <bits/stdc++.h>
using namespace std;
 
int n, r, q, cur = 0;
vector<int> h, s;
vector< vector<int> > g;
vector< vector< pair<int, int> > > reg;
 
int dfs(int u) {
  int st = cur++;
  int en = st;
  for (auto& v : g[u]) {
    en = dfs(v);
  }
  reg[h[u]].push_back({st, 1});
  reg[h[u]].push_back({en, -1});
  return en;
}
 
long long solve(int r1, int r2) {
  int cur = 0, idx = -1;
  long long ans = 0;
  for (auto& p : reg[r2]) {
    if (p.second == -1) {
      continue;
    }
    while (idx + 1 < (int) reg[r1].size() && reg[r1][idx + 1].first < p.first) {
      idx++;
      cur += reg[r1][idx].second;
    }
 
 
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• Subtask 1: 15 / 15
• Subtask 2: 60 / 85