paste bin
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source code:
#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; }
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