Submission #600237

#	Time	Username	Problem	Language	Result	Execution time	Memory
600237		_Avocado_	Rice Hub (IOI11_ricehub)	C++14	100 / 100	31 ms	3192 KiB

ricehub

#include <bits/stdc++.h>
#include "ricehub.h"
//#define int int64_t
using namespace std;

int bsearch(int n, int len, vector<int>&fred, vector<long long>&prefix, long long budget){
	int l = -1;
	int r = n+1;
	
	while(r-l > 1){
		int m = (r+l)/2;
		long long ans = 3e18;
		int mid = m/2+1;
		for(int i = m; i<=n; ++i){
			int hub = fred[mid];
			long long one = ((m/2) * hub)-(prefix[mid-1]-prefix[i-m]);
			long long two = (prefix[i]-prefix[mid-(1-m%2)]) - ((m/2)*hub);
			++mid;
			ans = min(ans, one+two);
		}
		if(ans <= budget) l = m;
		else r = m;

	}
	return l;
}
			

int besthub(int R, int L, int X[], long long B){
	int n = R;
	int len = L;
	long long budget = B;
	vector<long long>prefix(n+1);
	for(int i = 1; i<=n; ++i){
		prefix[i] = prefix[i-1] + X[i-1];
	}
	
	vector<int>fred;
	fred.push_back(0);
	for(int i = 0; i<n; ++i) fred.push_back(X[i]);
	
	return bsearch(n, len, fred, prefix, budget);
}

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