Submission #707666

#	Time	Username	Problem	Language	Result	Execution time	Memory
707666		SamNguyen	Boxes with souvenirs (IOI15_boxes)	C++14	0 / 100	1 ms	340 KiB

boxes

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

const long long INF = 1e18;

template <class T1, class T2>
inline bool minimise(T1 &x, T2 y) {
	if (x > y) { x = y; return true; }
	return false;
}

long long delivery(int N, int K, int L, int pos[]) {
	vector<int> lefts, rights;
	for (int i = 0; i < N; i++) {
		if (2 * pos[i] < L)
			lefts.push_back(pos[i]);
		else
			rights.push_back(L - pos[i]);
	}

	sort(lefts.begin(), lefts.end(), greater<int>());	
	sort(rights.begin(), rights.end(), greater<int>());	

	/*
	cerr << "K = " << K << endl;
	cerr << "lefts  = ";
	for (int e : lefts)
		cerr << e << " ";
	cerr << endl;
	cerr << "rights  = ";
	for (int e : rights)
		cerr << e << " ";
	cerr << endl;
	*/

	vector<long long> sum_lefts(lefts.size()), sum_rights(rights.size());
	for (int i = int(lefts.size() - 1); i >= 0; i--) {
		sum_lefts[i] = lefts[i];
		if (i + K < int(lefts.size()))
			sum_lefts[i] += sum_lefts[i + K];
	}

	for (int i = int(rights.size() - 1); i >= 0; i--) {
		sum_rights[i] = rights[i];
		if (i + K < int(rights.size()))
			sum_rights[i] += sum_rights[i + K];
	}

	/*
	cerr << "sum_lefts  = ";
	for (int e : sum_lefts)
		cerr << e << " ";
	cerr << endl;
	cerr << "sum_rights  = ";
	for (int e : sum_rights)
		cerr << e << " ";
	cerr << endl;
	*/

	long long ans = 2 * (sum_lefts.front() + sum_rights.front());
	for (int i = 0; i <= K; i++) {
		long long cur = 1LL * L;
		//cerr << "i = " << i;
		//cerr << " => cur = " << cur;
		if (i < int(lefts.size()))
			cur += 2 * sum_lefts[i];
		if (K - i < int(rights.size()))
			cur += 2 * sum_rights[K - i];


		//cerr << " => cur = " << cur << endl;

		minimise(ans, cur);
	}

	cerr << "return ans = " << ans << endl;

    return ans;
}

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