Submission #134568

#	Time	Username	Problem	Language	Result	Execution time	Memory
134568		20160161simone	Boxes with souvenirs (IOI15_boxes)	C++14	100 / 100	648 ms	293596 KiB

boxes

#include "boxes.h"
#include <bits/stdc++.h>
#define M 10000010
#define inf 0x3f3f3f3f3f3f3f
using namespace std;
long long mi[M],dpl[M],dpr[M];
long long delivery(int N, int K, int L, int p[]) 
{
    if(K==1)
    {
    	long long ans=0;
    	for(int i=0;i<N;i++) ans+=min(abs(L-p[i]),abs(p[i]))*2;
    	return ans;
	}
	if(K==N)
	{
		int li=p[0],lx=p[0],ri=p[N-1],rx=p[N-1];
        for (int i=0;i<N;i++)
		{
            if(p[i]*2<L) lx=p[i];
            if(p[i]*2==L) return L;
            if(p[i]*2>L) 
			{
				ri=p[i];
				break;
			}
        }
        if(li*2>L) return (L-li)*2;//*
		else 
			if(rx*2<L)return rx*2;//*
			else
            	if (L<lx*2+(L-ri)*2) return L;
            	else return lx*2+(L-ri)*2;//*
	}
	dpl[0]=0;
	for(int i=1;i<=N;i++) dpl[i]=dpl[max(i-K,0)]+p[i-1]*2;
	dpr[N+1]=0;
	for(int i=N;i>=1;i--) dpr[i]=dpr[min(N+1,i+K)]+(L-p[i-1])*2;
	long long ans=inf;
	for(int i=1;i<=N+1;i++) ans=min(ans,dpl[i-1]+dpr[i]);
	for(int i=0;i<N;i++)
	{
		if(i+K<=N)
		{
			ans=min(ans,L+dpl[i]+dpr[i+K+1]);
		}
	}
	return ans;
}

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