Submission #209650

#	Time	Username	Problem	Language	Result	Execution time	Memory
209650		Kenzo_1114	Boxes with souvenirs (IOI15_boxes)	C++17	100 / 100	895 ms	290568 KiB

boxes

#include<bits/stdc++.h>
#include "boxes.h"
using namespace std;
const int MAXN = 10000010;
const long long int INF = 2e17 + 7;
 
int N, K, L, POSITIONS[MAXN], pos[MAXN];
long long int clk[MAXN], cnt[MAXN];
 
long long int delivery(int n, int k, int l, int positions[])
{	
	for(int i = 0; i < n; i++)	pos[i + 1] = positions[i];

	sort(pos, pos + n + 1);
		
	for(int i = 1; i <= n; i++)
	{
		cnt[i] = 2 * pos[i];
		if(i - k > 0) cnt[i] += cnt[i - k];
	}
	
	for(int i = n; i > 0; i--)
	{
		clk[i] = 2 * (l - pos[i]);
		if(i + k <= n) clk[i] += clk[i + k];
	}
	
	long long int ans = INF;
 
	for(int i = 0; i <= n; i++)
		ans = min(ans, cnt[i] + clk[i + 1]);
 
	for(int i = 0; i + k + 1 <= n + 1; i++)
		ans = min(ans, cnt[i] + l + clk[i + k + 1]);
 
	for(int i = n + 1; i - k - 1 >= 0; i--)
		ans = min(ans, clk[i] + l + cnt[i - k - 1]);
 
	return	ans;
}
/*
int main ()
{
	scanf("%d %d %d", &N ,&K, &L);
	
	for(int i = 0; i < N; i++)	scanf("%d", &POSITIONS[i]);
	
	printf("%lld\n",delivery(N, K, L, POSITIONS));
}
*/
 
/*
	4 2 8 
	1 2 3 5
*/

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