Submission #997085

#	Time	Username	Problem	Language	Result	Execution time	Memory
997085		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 < n; 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)
	{ac
		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:7:38: error: expected ',' or '...' before 'w'
    7 | int* find_subset(int l, int u, int[] w)
      |                                      ^
molecules.cpp: In function 'int* find_subset(int, int, int*)':
molecules.cpp:10:22: error: 'n' was not declared in this scope
   10 |  for (int i = 0; i < n; i++) nums.push_back({w[i], i});
      |                      ^
molecules.cpp:10:46: error: 'w' was not declared in this scope
   10 |  for (int i = 0; i < n; i++) nums.push_back({w[i], i});
      |                                              ^
molecules.cpp:10:54: error: no matching function for call to 'std::vector<std::pair<int, int> >::push_back(<brace-enclosed initializer list>)'
   10 |  for (int i = 0; i < n; i++) nums.push_back({w[i], i});
      |                                                      ^
In file included from /usr/include/c++/10/vector:67,
                 from /usr/include/c++/10/queue:61,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:86,
                 from molecules.cpp:1:
/usr/include/c++/10/bits/stl_vector.h:1187:7: note: candidate: 'void std::vector<_Tp, _Alloc>::push_back(const value_type&) [with _Tp = std::pair<int, int>; _Alloc = std::allocator<std::pair<int, int> >; std::vector<_Tp, _Alloc>::value_type = std::pair<int, int>]'
 1187 |       push_back(const value_type& __x)
      |       ^~~~~~~~~
/usr/include/c++/10/bits/stl_vector.h:1187:35: note:   no known conversion for argument 1 from '<brace-enclosed initializer list>' to 'const value_type&' {aka 'const std::pair<int, int>&'}
 1187 |       push_back(const value_type& __x)
      |                 ~~~~~~~~~~~~~~~~~~^~~
/usr/include/c++/10/bits/stl_vector.h:1203:7: note: candidate: 'void std::vector<_Tp, _Alloc>::push_back(std::vector<_Tp, _Alloc>::value_type&&) [with _Tp = std::pair<int, int>; _Alloc = std::allocator<std::pair<int, int> >; std::vector<_Tp, _Alloc>::value_type = std::pair<int, int>]'
 1203 |       push_back(value_type&& __x)
      |       ^~~~~~~~~
/usr/include/c++/10/bits/stl_vector.h:1203:30: note:   no known conversion for argument 1 from '<brace-enclosed initializer list>' to 'std::vector<std::pair<int, int> >::value_type&&' {aka 'std::pair<int, int>&&'}
 1203 |       push_back(value_type&& __x)
      |                 ~~~~~~~~~~~~~^~~
molecules.cpp:34:3: error: 'ac' was not declared in this scope
   34 |  {ac
      |   ^~
molecules.cpp:38:4: error: 'ans' was not declared in this scope; did you mean 'abs'?
   38 |    ans[i-left] = nums[i].second;
      |    ^~~
      |    abs
molecules.cpp:40:10: error: 'ans' was not declared in this scope; did you mean 'abs'?
   40 |   return ans;
      |          ^~~
      |          abs
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];
      |       ^~~