AtCoder Beginners Contest 081 [A to C]



A. Placing Marbles … Count “1” in the input string


B. Shift Only … Add the result into the temporary list if the number modulo 2 is 0. In each iteration of the list, compare the length of the original list and temporary list.


C. Not So Diverse … In python, there is a Counter function which can create a dictionary from a list. In this case, take a list of numbers, and make a dictionary which has “number” as a key, and “times of the number appears in the list” as a value.