Submission #871812

#	Time	Username	Problem	Language	Result	Execution time	Memory
871812		dsyz	Rice Hub (IOI11_ricehub)	C++17	49 / 100	15 ms	3688 KiB

ricehub

#include <bits/stdc++.h>
#include "ricehub.h"
using namespace std;
using ll = long long;
#define MAXN (1000005)

int besthub(int R, int L, int X[], long long B){
	ll maximum = 0;
	ll Lptr = 0;
	ll Rptr = 0;
	ll curcost = 0;
	while(Lptr > 0 && curcost + abs(X[0] - X[Lptr - 1]) <= B){
		curcost += abs(X[0] - X[Lptr - 1]);
		Lptr--;
	}
	while(Rptr < R - 1 && curcost + abs(X[0] - X[Rptr + 1]) <= B){
		curcost += abs(X[0] - X[Rptr + 1]);
		Rptr++;
	}
	while(Rptr < R - 1 && abs(X[0] - X[Lptr]) > abs(X[0] - X[Rptr + 1])){
		curcost -= abs(X[0] - X[Lptr]);
		curcost += abs(X[0] - X[Rptr + 1]);
		Lptr++;
		Rptr++;
		while(Rptr < R - 1 && curcost + abs(X[0] - X[Rptr + 1]) <= B){
			curcost += abs(X[0] - X[Rptr + 1]);
			Rptr++;
		}
	}
	maximum = max(maximum,Rptr - Lptr + 1);
	for(ll pos = 1;pos < R;pos++){
		if(Rptr >= pos){
			curcost += ((pos - Lptr) * abs(X[pos] - X[pos - 1]));
			curcost -= ((Rptr - pos + 1) * abs(X[pos] - X[pos - 1]));
		}else{
			curcost += ((pos - Lptr) * abs(X[pos] - X[pos - 1]));
			while(Rptr < pos){
				Rptr++;
				curcost += abs(X[pos] - X[Rptr]);
			}
		}
		while(Lptr < pos && curcost > B){
			curcost -= abs(X[pos] - X[Lptr]);
			Lptr++;
		}
		while(Rptr < R - 1 && curcost + abs(X[pos] - X[Rptr + 1]) <= B){
			curcost += abs(X[pos] - X[Rptr + 1]);
			Rptr++;
		}
		while(Rptr < R - 1 && abs(X[pos] - X[Lptr]) > abs(X[pos] - X[Rptr + 1])){
			curcost -= abs(X[pos] - X[Lptr]);
			curcost += abs(X[pos] - X[Rptr + 1]);
			Lptr++;
			Rptr++;
			while(Rptr < R - 1 && curcost + abs(X[pos] - X[Rptr + 1]) <= B){
				curcost += abs(X[pos] - X[Rptr + 1]);
				Rptr++;
			}
		}
		maximum = max(maximum,Rptr - Lptr + 1);
	}
	return maximum;
}

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