Submission #787577

#	Time	Username	Problem	Language	Result	Execution time	Memory
787577		bane	Rice Hub (IOI11_ricehub)	C++17	100 / 100	57 ms	3128 KiB

ricehub

#include "ricehub.h"
#include <bits/stdc++.h>
using namespace std;

int besthub(int R, int L, int x[], long long B)
{

  vector<long long>X(R+1);
  X[0] = -(long long)1e18;
  for (int i = 1; i <= R; i++){
    X[i] = x[i - 1];
  }
  int l = 1, r = R;
  long long pf[R+1];
  pf[0] = 0;
  for (int i = 1; i<=R; i++){
    pf[i] = pf[i - 1] + X[i];
  }

  function<bool(int)>check = [&](int mid){
    int r = 0;
    int l = 1;
    while(r + 1 <= R){
      ++r;
      while(r - l + 1 > mid){
        ++l;
      }

      if (r - l + 1 == mid){
        int itt = (r + l) / 2;
        for (int it = itt - 20 ; it <= itt + 20; it++){
          if (it < l || it > r)continue;
          long long sum = 0;
          if (it != l){
            sum += (it - l) * X[it] - (pf[it-1] - pf[l-1]);
          }
          if (it != r){
            sum += -(r - it) * X[it] + (pf[r] - pf[it]);
          }
          if (sum <= B)return true;
        }
      }
    }

    return false;
  };
  while(l<=r){
    int mid = (l+r) / 2;
    if (check(mid)){
      l = mid + 1;
    }else{
      r = mid - 1;
    }
  }
  return l - 1;
}

• Subtask 1: 17 / 17
• Subtask 2: 25 / 25
• Subtask 3: 26 / 26
• Subtask 4: 32 / 32