Submission #994062

#	Time	Username	Problem	Language	Result	Execution time	Memory
994062		TgX_2	Arranging Shoes (IOI19_shoes)	C++17	Compilation error	0 ms	0 KiB

shoes

#include <bits/stdc++.h>
using namespace std;


int count_swaps(vector<int> s) {
    int cnt = 0;
    int n = s.size();
    for(int i = 0; i < n; i++) {
        if (i & 1 and a[i] < 0) cnt++;
        else if (i % 2 == 0 and a[i] > 0) cnt++;
    }
    return cnt;
}

Compilation message (stderr)

shoes.cpp: In function 'int count_swaps(std::vector<int>)':
shoes.cpp:9:23: error: 'a' was not declared in this scope
    9 |         if (i & 1 and a[i] < 0) cnt++;
      |                       ^