when both the pointers are pointing to the same elements ( point 3 )
if ( _one . first == _two . second && _two . first == _one . second ) { if ( a1 [ _one . first ] < a2 [ _one . second ] ) { cout << " [ " << a1 [ _one . first ] << " , ▁ " << a2 [ _one . second ] << " ] ▁ " ;