Submission #997093

#	Time	Username	Problem	Language	Result	Execution time	Memory
997093		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>

int * find_subset(int l, int u, int w[])
{
	vector<pii> nums;
	int c = 1;
	for (int ele:w) nums.push_back({ele, c++});
	sort(nums.begin(), nums.end());
	int left=0, right=0;
	long long sum = 0;
	while (sum <= l)
	{
		sum += nums[right].first;
		right++;
	}
	right--;	
	sum -= nums[right].first;
	while (sum <= u)
	{
		sum += nums[right].first;
		right++;
		sum -= nums[left].first;
		left++;
	}
	right--;
	sum -= nums[right].first;
	left--;
	sum -= nums[left].first;

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

Compilation message (stderr)

molecules.cpp: In function 'int* find_subset(int, int, int*)':
molecules.cpp:11:15: error: 'begin' was not declared in this scope; did you mean 'std::begin'?
   11 |  for (int ele:w) nums.push_back({ele, c++});
      |               ^
      |               std::begin
In file included from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:95,
                 from molecules.cpp:1:
/usr/include/c++/10/valarray:1224:5: note: 'std::begin' declared here
 1224 |     begin(const valarray<_Tp>& __va)
      |     ^~~~~
molecules.cpp:11:15: error: 'end' was not declared in this scope; did you mean 'std::end'?
   11 |  for (int ele:w) nums.push_back({ele, c++});
      |               ^
      |               std::end
In file included from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:95,
                 from molecules.cpp:1:
/usr/include/c++/10/valarray:1244:5: note: 'std::end' declared here
 1244 |     end(const valarray<_Tp>& __va)
      |     ^~~
molecules.cpp:41:10: warning: address of local variable 'ans' returned [-Wreturn-local-addr]
   41 |   return ans;
      |          ^~~
molecules.cpp:36:7: note: declared here
   36 |   int ans[right-left];
      |       ^~~
molecules.cpp:46:10: warning: address of local variable 'ans' returned [-Wreturn-local-addr]
   46 |   return ans;
      |          ^~~
molecules.cpp:45:7: note: declared here
   45 |   int ans[0];
      |       ^~~