Submission #563336

#	Time	Username	Problem	Language	Result	Execution time	Memory
563336		1ne	Rice Hub (IOI11_ricehub)	C++14	68 / 100	1090 ms	3768 KiB

ricehub

#include "ricehub.h"
#include<bits/stdc++.h>
using namespace std;
int besthub(int R, int L, int X[], long long B)
{
  int ans = 0;
  vector<int64_t>pref(R + 1,0),dpref(R + 1,0);
  vector<int64_t>suff(R + 1,0),dsuff(R + 1,0);
  for (int i = 0 ;i<R - 1;++i){
	  pref[i + 1] = pref[i] + (X[i + 1] - X[i]);
	  dpref[i + 2] = pref[i + 1] + dpref[i + 1];
  }
   for (int i = R - 2 ;i>=0;--i){
	  suff[i] = suff[i + 1] + (X[i + 1] - X[i]);
	  dsuff[i] = suff[i] + dsuff[i + 1];
  }
 auto dist = [&](int l,int r){
	 return pref[r] * (r - l) - dpref[r] + dpref[l];
  };
  auto dist2 = [&](int l,int r){
	 return suff[l] * (r - l) + dsuff[r + 1] - dsuff[l + 1];
  };
  auto distt = [&](int l,int r){
		int mid = (l + r)>>1;
		return dist(l,mid) + dist2(mid,r);
	};
   for (int i = 0;i<R;++i){
		int l = 0;
		int left = 0,right = i;
		while(left<=right){
			int mid = (left + right)>>1;
			if (dist(mid,i)<=B){
				l = mid;
				right = mid - 1;
			} 
			else left = mid + 1;
		}
		int counts = i - l + 1;
		int j = i + 1;
		ans = max(ans,counts);
		while(j<R && l<=i){
			if (distt(l,j)<=B){
				counts++;
				++j;
			}
			else if (l == i){
				break;
			}
			else{
				counts--;
				++l;
			}
			ans = max(ans,counts);
		}
  }
  return ans;
}

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