Submission #854419

#	Time	Username	Problem	Language	Result	Execution time	Memory
854419		KN200711	Boxes with souvenirs (IOI15_boxes)	C++14	100 / 100	768 ms	458708 KiB

boxes

#include "boxes.h"
# include <bits/stdc++.h>
# define ll long long
using namespace std;

const int MXN = 1e7;
ll sm[MXN];

ll delivery(int N, int K, int L, int p[]) {
	vector<ll> pp;
	pp.clear();
	
	for(int i=0;i<N;i++) pp.push_back(p[i]);
	sort(pp.begin(), pp.end());
	
	vector<ll> pref(N), suff(N + 1);
	
	for(int i=0;i<K;i++) sm[i] = 0ll;
	for(int i=0;i<N;i++) {
		sm[i%K] += 2ll * pp[i];
		pref[i] = sm[i%K];
	}
	
	for(int i=0;i<K;i++) sm[i] = 0ll;
	for(int i=N-1;i>=0;i--) {
		sm[i%K] += 2ll * L - 2ll * pp[i];
		suff[i] = sm[i%K];
	}
	suff[N] = 0ll;
	
	vector<ll> solve(N);
	for(int i=0;i<N;i++) {
		solve[i] = pref[i];
		if(i == K-1) solve[i] = min(solve[i], 1ll * L);
		else if(i > K) solve[i] = min(solve[i], solve[i - K] + 1ll * L);
	}
	
	ll ans = suff[0];
	for(int i=0;i<N;i++) {
		ans = min(ans, solve[i] + suff[i+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