Submission #393227

#	Time	Username	Problem	Language	Result	Execution time	Memory
393227		peuch	Boxes with souvenirs (IOI15_boxes)	C++17	100 / 100	523 ms	196076 KiB

boxes

#include "boxes.h"
#include<bits/stdc++.h>
using namespace std;
 
const int MAXN = 1e7 + 10;
 
long long l[MAXN], r[MAXN];
 
long long delivery(int N, int K, int L, int p[]) {
	long long n = N;
	long long k = K;
	for(int i = 0; i < N; i++){
		l[i] = 2 * p[i];
		if(i >= k) l[i] += l[i - k];
	}
	for(int i = N - 1; i >= 0; i--){
		r[i] = 2 * (L - p[i]);
		if(i + k < N) r[i] += r[i + k];
	}
	long long ans = 1e18;
	for(int i = 0; i < N - 1; i++) ans = min(ans, l[i] + r[i + 1]);
	
	ans = min(ans, l[n - 1]);
	ans = min(ans, r[0]);
	
	if(k == n) ans = min(ans, (long long)L);
	else ans = min(ans, L + r[k]), ans = min(ans, l[n - k - 1] + L);
	
	for(int i = 1; i + k < n; i++) ans = min(ans, l[i - 1] + L + r[i + k]);
	
	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