Submission #1015191

#	Time	Username	Problem	Language	Result	Execution time	Memory
1015191		vjudge1	Gap (APIO16_gap)	C++17	47.68 / 100	49 ms	3416 KiB

gap

#include<bits/stdc++.h>
#include "gap.h"

using namespace std;

typedef long long ll;


ll subtask1(int N);

ll subtask2(ll s = 0, ll e = 1e18)
{
  if(s >= e) return 0;
  
  ll mid = (s + e) / 2;
  ll mx1, mx2, mn1, mn2;

  MinMax(s, mid, &mn1, &mx1);
  MinMax(mid + 1, e, &mn2, &mx2);
  
  if(mn2 == -1) return subtask2(mn1, mx1);
  if(mn1 == -1) return subtask2(mn2, mx2);

  ll ans = mn2 - mx1;

  if(mx1 - mn1 < mx2 - mx2)
    swap(mx1, mx2), swap(mn1, mn2);
  
  if(ans < mx1 - mn1)
    ans = max(ans, subtask2(mn1, mx1));
  
  if(ans < mx2 - mn2)
    ans = max(ans, subtask2(mn2, mx2));

  return ans;
}

ll findGap(int T, int N)
{
  if(T == 1)
    return subtask1(N);
  return subtask2();
}
















ll subtask1(int N)
{
  int i = 0, j = N - 1;
  ll s = 0, e = 1e18;
  ll *mn = new ll, *mx = new ll;

  vector<ll> v(N);
  
  while(i <= j && s <= e)
    {
      MinMax(s, e, mn, mx);
      v[i] = *mn;
      v[j] = *mx;
      i++, j--;
      s = *mn + 1;
      e = *mx - 1;
    }

  ll ans = 0;
  for(int i = 1; i < v.size(); i++)
    ans = max(ans, v[i] - v[i - 1]);
  return ans;
}

Compilation message (stderr)

gap.cpp: In function 'll subtask1(int)':
gap.cpp:79:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   79 |   for(int i = 1; i < v.size(); i++)
      |                  ~~^~~~~~~~~~

• Subtask 1: 30 / 30
• Subtask 2: 17.6761911006 / 70