Submission #430930

#	Time	Username	Problem	Language	Result	Execution time	Memory
430930		KalasLavas	Boxes with souvenirs (IOI15_boxes)	C++14	50 / 100	2073 ms	29516 KiB

boxes

#include <bits/stdc++.h>
#include "boxes.h"
using namespace std;
#define F first
#define S second
using ll = long long;
using pii= pair<int,int>;
using pll= pair<ll,ll>;
int n,k,len,*p;
ll ans=LLONG_MAX;
ll pref[1000001], suff[1000001];
ll delivery(int _N, int _K, int _L, int _p[])
{
	n=_N; k=_K; len=_L; p=_p;
	for(int i=0;i<n;i++) pref[i] = (p[i]<<1) + (i<k?0:pref[i-k]);
	for(int i=n-1;i>=0;i--) suff[i] = ((len-p[i])<<1) + (i+k>n?0:suff[i+k]);
		
	for(int i=-1;i<n;i++)
	{
		for(int j=i+1;j<=n;j++)
		{
			ans = min(ans, (i==-1?0:pref[i]) + suff[j] + (1LL*j-1-i-1+k)/k*len);
			//cerr<<i<<' '<<j<<" - "<<pref[i]<<' '<<suff[j]<<' '<<(1LL*j-1-i-1+k)/k*len<<endl;
		}
		
	}
	return ans;
}
/*
4 8 8
3 4 5 6

4 8 9
3 4 5 6

3 2 8
1 2 5
*/

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