Submission #62612

#	Time	Username	Problem	Language	Result	Execution time	Memory
62612		Eae02	Detecting Molecules (IOI16_molecules)	C++14	100 / 100	76 ms	6624 KiB

molecules

#include "molecules.h"

#include <bits/stdc++.h>
#define all(x) x.begin(),x.end()

struct Item
{
	int weight;
	int index;
	
	bool operator<(const Item& other) const
	{ return weight < other.weight; }
};

std::vector<int> find_subset(int l, int u, std::vector<int> w)
{
	std::vector<Item> items(w.size());
	for (int i = 0; i < w.size(); i++)
	{
		items[i].weight = w[i];
		items[i].index = i;
	}
	
	std::sort(all(items));
	
	int beg = 0;
	int end = 0;
	uint64_t sum = 0;
	
	while (end <= items.size())
	{
		if (sum > (uint64_t)u)
		{
			sum -= (uint64_t)items[beg].weight;
			beg++;
		}
		else if (sum < (uint64_t)l)
		{
			sum += (uint64_t)items[end].weight;
			end++;
		}
		else
		{
			std::vector<int> indices;
			for (int i = beg; i < end; i++)
				indices.push_back(items[i].index);
			return indices;
		}
	}
	
	return {};
}

Compilation message (stderr)

molecules.cpp: In function 'std::vector<int> find_subset(int, int, std::vector<int>)':
molecules.cpp:18:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = 0; i < w.size(); i++)
                  ~~^~~~~~~~~~
molecules.cpp:30:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  while (end <= items.size())
         ~~~~^~~~~~~~~~~~~~~

• Subtask 1: 9 / 9
• Subtask 2: 10 / 10
• Subtask 3: 12 / 12
• Subtask 4: 15 / 15
• Subtask 5: 23 / 23
• Subtask 6: 31 / 31