paste bin

malic
C++
#include <cstdio>
#include <set>
using namespace std;

int main(void)
{
    int N,x;
    scanf("%d",&N);
    set<int> s;
    while(N--)
    {
        scanf("%d",&x);
        if(s.count(x)==0)
            s.insert(x);
        else
            s.erase(x);
    }
    printf("%d\n",s.size());
    return 0;
}

2019 C5QC

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