Submission #997112

#	Time	Username	Problem	Language	Result	Execution time	Memory
997112		codefox	Detecting Molecules (IOI16_molecules)	C++14	Compilation error	0 ms	0 KiB

molecules

#include<bits/stdc++.h>

using namespace std;

#define pii pair<int, int>

vector<int> find_subset(int l, int u, vector<int> w)
{
	int n = w.size();
	vector<pii> nums;
	for (int i = 0; i < n; i++) nums.push_back({w[i], i});
	sort(nums.begin(), nums.end());
	int lefts=n, rights=n;
	long long sum = 0;
	while (sum <= u)
	{
		left--;
		sum += nums[lefts].first;
	}
	sum -= nums[lefts].first;
	lefts++;
	while (sum < l)
	{
		rights--;
		sum -= nums[rights].first;
		lefts--;
		sum += nums[lefts].first;
	}

	if (sum >= l)
	{
		vector<int> ans(rights-lefts);
		for (int i = lefts; i < rights; i++)
		{
			ans[i-lefts] = nums[i].second;
		}
		return ans;
	}
	else 
	{
		vector<int> ans(0);
		return ans;
	}
}

Compilation message (stderr)

molecules.cpp: In function 'std::vector<int> find_subset(int, int, std::vector<int>)':
molecules.cpp:17:3: warning: ISO C++ forbids decrementing a pointer of type 'std::ios_base& (*)(std::ios_base&)' [-Wpointer-arith]
   17 |   left--;
      |   ^~~~
molecules.cpp:17:3: error: lvalue required as decrement operand