Submission #1235184

#	Time	Username	Problem	Language	Result	Execution time	Memory
1235184		rhm_gan	Arranging Shoes (IOI19_shoes)	C++20	Compilation error	0 ms	0 KiB

shoes

#include "shoes.h"

int64_t count_swaps(vector<int> a) {
	int n = a.size();
	int64_t res = 0;
	for (int i = 0; i < n; i += 2) {
		int id = 0;
		for (int j = i + 1; j < n; j++) {
			if (-a[j] == a[i]) {
				id = j;
				break;
			}
		}
		res += id - i - 1;
		for (int j = id - 1; j > i; j--) {
			swap(a[j], a[j + 1]);
		}
		if (a[i] > 0) {
			res++;
			swap(a[i], a[i + 1]);
		}
	}

	return res;
}

Compilation message (stderr)

shoes.cpp:3:21: error: 'int64_t count_swaps' redeclared as different kind of entity
    3 | int64_t count_swaps(vector<int> a) {
      |                     ^~~~~~
In file included from shoes.cpp:1:
shoes.h:7:11: note: previous declaration 'long long int count_swaps(std::vector<int>)'
    7 | long long count_swaps(std::vector<int> S);
      |           ^~~~~~~~~~~
shoes.cpp:3:21: error: 'vector' was not declared in this scope
    3 | int64_t count_swaps(vector<int> a) {
      |                     ^~~~~~
shoes.cpp:3:21: note: suggested alternatives:
In file included from /usr/include/c++/11/vector:67,
                 from shoes.h:5,
                 from shoes.cpp:1:
/usr/include/c++/11/bits/stl_vector.h:389:11: note:   'std::vector'
  389 |     class vector : protected _Vector_base<_Tp, _Alloc>
      |           ^~~~~~
In file included from shoes.h:5,
                 from shoes.cpp:1:
/usr/include/c++/11/vector:86:13: note:   'std::pmr::vector'
   86 |       using vector = std::vector<_Tp, polymorphic_allocator<_Tp>>;
      |             ^~~~~~
shoes.cpp:3:28: error: expected primary-expression before 'int'
    3 | int64_t count_swaps(vector<int> a) {
      |                            ^~~