Bit Manipulation 0136_single_number 0169_majority_element 0190_reverse_bits 0191_number_of_1_bits 0231_power_of_two 0268_missing_number 0342_power_of_four 0371_sum_of_two_integers 0389_find_the_difference 0401_binary_watch 0405_convert_a_number_to_hex 0461_hamming_distance 0476_number_complement