Submission #64621

#	Time	Username	Problem	Language	Result	Execution time	Memory
64621		gnoor	Rice Hub (IOI11_ricehub)	C++17	100 / 100	32 ms	16760 KiB

ricehub

#include "ricehub.h"

long long b;
long long pos[100100];
long long qs[100100];
int n;

bool work(int num) {
	int x=num/2;
	int hub;
	long long cur;
	for (int i=num;i<=n;i++) {
		hub=i-x;
		cur=qs[i]-qs[hub]-pos[hub]*x;
		cur+=pos[hub]*(num-x)-qs[hub]+qs[i-num];
		if (cur<=b) return true;
	}
	return false;
}

int besthub(int R, int L, int X[], long long B)
{
	b=B;
	n=R;
	for (int i=1;i<=n;i++) {
		qs[i]=pos[i]=X[i-1];
		qs[i]+=qs[i-1];
	}		

	int lo=1;
	int hi=R;
	int mid;
	while (lo<hi) {
		mid=(lo+hi+1)>>1;
		if (work(mid)) lo=mid;
		else hi=mid-1;
	}
	return lo;
}

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