text: Check if arr [ mid ] is the first occurrence of x . arr [ mid ] is first occurrence if x is one of the following is true : ( i ) mid == 0 and arr [ mid ] = = x ( ii ) arr [ mid - 1 ] < x and arr [ mid ] == x
code: if ( mid == 0 or x > arr [ mid - 1 ] ) and ( arr [ mid ] == x ) : NEW_LINE INDENT return mid NEW_LINE DEDENT elif x > arr [ mid ] : NEW_LINE INDENT return _binarySearch ( arr , ( mid + 1 ) , high , x ) NEW_LINE DEDENT else : NEW_LINE INDENT return _binarySearch ( arr , low , ( mid - 1 ) , x ) NEW_LINE DEDENT return - 1 NEW_LINE