Submission #997095

#	Time	Username	Problem	Language	Result	Execution time	Memory
997095		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;
	for (int i = 0; i < sizeof(w); i++) nums.push_back({w[i], i});
	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:10:29: warning: 'sizeof' on array function parameter 'w' will return size of 'int*' [-Wsizeof-array-argument]
   10 |  for (int i = 0; i < sizeof(w); i++) nums.push_back({w[i], i});
      |                            ~^~
molecules.cpp:7:37: note: declared here
    7 | int * find_subset(int l, int u, int w[])
      |                                 ~~~~^~~
molecules.cpp:10:20: warning: comparison of integer expressions of different signedness: 'int' and 'long unsigned int' [-Wsign-compare]
   10 |  for (int i = 0; i < sizeof(w); i++) nums.push_back({w[i], i});
      |                  ~~^~~~~~~~~~~
molecules.cpp:40:10: warning: address of local variable 'ans' returned [-Wreturn-local-addr]
   40 |   return ans;
      |          ^~~
molecules.cpp:35:7: note: declared here
   35 |   int ans[right-left];
      |       ^~~
molecules.cpp:45:10: warning: address of local variable 'ans' returned [-Wreturn-local-addr]
   45 |   return ans;
      |          ^~~
molecules.cpp:44:7: note: declared here
   44 |   int ans[0];
      |       ^~~
/usr/bin/ld: /tmp/ccr70ih2.o: in function `main':
grader.cpp:(.text.startup+0x18d): undefined reference to `find_subset(int, int, std::vector<int, std::allocator<int> >)'
collect2: error: ld returned 1 exit status