Submission #138811

#	Time	Username	Problem	Language	Result	Execution time	Memory
138811		dnass	Boxes with souvenirs (IOI15_boxes)	C++14	10 / 100	3 ms	1012 KiB

boxes

#include "boxes.h"
#include <bits/stdc++.h>
using namespace std;
typedef long long int lld;

int n, k, l;
vector<int> lhalf, rhalf;
int lsize, rsize;

long long delivery(int N, int K, int L, int p[]){
	lld cost = 0;
	n = N; k = K; l = L;
	if(n==1) return min((lld)2*p[0], (lld)2*(l-p[0]));
	
	if(k==1){
		lld ssss = 0;
		for(int i=0;i<n;i++){
			ssss += min((lld)2*p[i], (lld)2*(l-p[i]));
		}
		return ssss;
	}
	
	for(int i=0;2*p[i]<=l;i++){
		lhalf.push_back(p[i]);
	}
	lsize = (int) lhalf.size();
	for(int i=n-1;2*(l-p[i])<l;i--){
		rhalf.push_back(l-p[i]);
	}
	rsize = (int) rhalf.size();
	while(2*lhalf[lsize-1]+2*rhalf[rsize-1]>l){
		int left_beg, right_end;
		int new_lsize = -1, new_rsize = -1;
		left_beg = max(0, lsize-k); right_end = rsize-(k-(lsize-left_beg));
		int mx_span = -1;
		while(left_beg<=lsize){
			int pos_to_the_left, pos_to_the_right;
			if(left_beg==0) pos_to_the_left = 0;
			else pos_to_the_left = lhalf[left_beg-1];
			if(right_end==0) pos_to_the_right = 0;
			else pos_to_the_right = rhalf[right_end-1];
			if(l-(pos_to_the_left+pos_to_the_right)>mx_span){
				mx_span = l-(pos_to_the_left+pos_to_the_right);
				new_lsize = left_beg;
				new_rsize = right_end;
			}
			left_beg++; right_end--;
		}
		if(lsize==new_lsize){
			cost += (lld) 2*rhalf[rsize-1];
		}else if(rsize==new_rsize){
			cost += (lld) 2*lhalf[lsize-1];
		}else{
			cost += (lld)l;
		}
		lsize = new_lsize;
		rsize = new_rsize;

	}
	int pos_right = rsize-1;
	int pos_left = lsize-1;
	while(pos_right>=0){
		cost += 2*rhalf[pos_right];
		pos_right -= k;
	}
	while(pos_left>=0){
		cost += 2*lhalf[pos_left];
		pos_left -= k;
	}
	return cost;
}

• Subtask 1: 10 / 10
• Subtask 2: 0 / 10
• Subtask 3: 0 / 15
• Subtask 4: 0 / 15
• Subtask 5: 0 / 20
• Subtask 6: 0 / 30