#include #include using namespace std; int main(void) { map int_count; int n,i,a; cin>>n; for(i=0;i>a; ++int_count[a]; } map::iterator map_it=int_count.begin(); int tal=n; while(map_it!=int_count.end()) { //cout<first<<"次数为:"<second<second%2==1) tal--; map_it++; } cout<