Submission #488968

#	Time	Username	Problem	Language	Result	Execution time	Memory
488968		fun_day	Rice Hub (IOI11_ricehub)	C++14	0 / 100	167 ms	692 KiB

ricehub

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

int besthub(int R, int L, int X[] , long long B){
  int best = 0;
  vector<long long> v(R);
  for(int i = 0 ; i < R ; i++){
    v[i] = (long long) X[i];
  }
  vector<long long> pref(R);
  for(int i = 0 ; i < R ; i++){
    if(i == 0) pref[i] = X[i];
    else pref[i] = X[i] + pref[i - 1];
  }
  for(int i = 1 ; i < R ; i++){
    int ans = 0;
    long long s = 0;
    int l = i - 1 , r = i + 1;
    while(l >= 0 || r < R){
      long long f_dist = (l >= 0 ? X[i] - X[l] : (long long)1e18) , s_dist = (r < R ? X[r] - X[i] : (long long)1e18);
      if(f_dist >= s_dist){
        int id = upper_bound(v.begin(),v.end() , v[i] + f_dist) - v.begin();
        long long sum = pref[id - 1] - pref[i];
        s += sum - (id - i - 1) * X[i];
        if(s <= B) ans += (id - i - 1);
        r = id;
      }
      else{
        int id = lower_bound(v.begin(),v.end() , v[i] - s_dist) - v.begin();
        long long sum = pref[i] - (id > 0 ? pref[id - 1] : 0);
        s += (i - id) * X[i] - sum;
        if(s <= B) ans += (i - id);
        l = id - 1;
      }
      if(s > B) break;
    }
    while(l >= 0 || r < R){
      if((l < 0) || (r < R && X[r] - X[i] <= X[i] - X[l])){
        s += X[r] - X[i];
        r++;
      }
      else if((r >= R) || (l >= 0 && X[i] - X[l] <= X[r] - X[i])){
        s += X[i] - X[l];
        l--;
      }
      if(s > B) break;
      ans++;
    }
    best = max(best , ans);
    if(best == R - 1) break;
  }
  return best + 1;
}

/*int main(){
  int arr[] = {1,2,10,12,14};
  cout << besthub(5 , 20 , arr , 6) << '\n';
}*/

• Subtask 1: 0 / 17
• Subtask 2: 0 / 25
• Subtask 3: 0 / 26
• Subtask 4: 0 / 32