Challenge - #33 - collections.Counter()
# Enter your code here. Read input from STDIN. Print output to STDOUT from collections import Counter no_of_shoes = int ( input ()) size_lst = map ( int , input ().split()) no_of_customers = int ( input ()) shoes = Counter(size_lst) income = 0 for i in range (no_of_customers): size, price = map ( int , input ().split()) if shoes[size]: income += price shoes[size] -= 1 print (income)