Submission #1204048

#	Time	Username	Problem	Language	Result	Execution time	Memory
1204048		arkanefury	Arranging Shoes (IOI19_shoes)	C++20	Compilation error	0 ms	0 KiB

shoes

#include "shoes"
using namespace std;
const int N = 2e5+5;
int a[N];
int count_swaps(vector<int>v){
    int n = v.size();
    for(int i = 0; i < n; i ++){
        if(v[i] > 0)a[v[i]] = i;
        else a[v[i] * -1] = i;
    }
    int ans = 0, x = 0;
    for(int i = 1; i <= n/2; i ++){
        ans += a[i] - x + b[i] - x - 1;
        x += 2;
    }
    return ans;
}

Compilation message (stderr)

shoes.cpp:5:17: error: 'vector' was not declared in this scope
    5 | int count_swaps(vector<int>v){
      |                 ^~~~~~
shoes.cpp:2:1: note: 'std::vector' is defined in header '<vector>'; did you forget to '#include <vector>'?
    1 | #include "shoes"
  +++ |+#include <vector>
    2 | using namespace std;
shoes.cpp:5:24: error: expected primary-expression before 'int'
    5 | int count_swaps(vector<int>v){
      |                        ^~~