#include <vector>
#include <iostream>
using namespace std;
int main( )
{
vector<bool> shots( 5 ); // true if pet has shot
// give shots to two pets
shots[1] = true;
shots[4].flip();
// delete the first element because that pet was adopted
shots.erase( shots.begin() );
// flip bits to show pets needing shots
shots.flip();
}
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