Submission #430461

#	Time	Username	Problem	Language	Result	Execution time	Memory
430461		schse	Finding Routers (IOI20_routers)	C++17	100 / 100	5 ms	588 KiB

routers

#include "routers.h"
#include <bits/stdc++.h>
#ifndef EVAL
#include "grader.cpp"
#endif
using namespace std;

map<int, int> detus;
int dtu;
int det(int x)
{
  if (detus.count(x))
    return detus[x];
  dtu++;
  return detus[x] = use_detector(x);
}

int findrouter(int b, int e, int v)
{

  while (e - b != 1)
  {
    if (det((e + b) / 2) < v)
      b = (e + b) / 2;
    else
      e = (e + b) / 2;
  }
  return b;
}

std::vector<int> find_routers(int l, int n, int q)
{
  std::vector<int> ans(1, 0);
  for (int i = 1; i < n; i++)
  {
    int t = findrouter(1, l, i);
    int dist = t - ans.back();
    ans.push_back(dist * 2 + ans.back());
  }

  return ans;
}

• Subtask 1: 16 / 16
• Subtask 2: 21 / 21
• Subtask 3: 23 / 23
• Subtask 4: 40 / 40