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n, m = input().split(" ")
arr = [int(i) for i in input().split(" ")]
a = set([int(i) for i in input().split(" ")])
b = set([int(i) for i in input().split(" ")])
sums = []
for i in arr:
if i in a:
sums.append(1)
elif i in b:
sums.append(-1)
print(sum(sums))
This is the stupidest website I have ever visited. The main challenge with this 'medium' problem was figuring out the ABSURD way inputs are given!
n is an array OH BUT ACTUALLY IT'S A STRING.
Useless waste of time.
n, m = input().split(" ") arr = [int(i) for i in input().split(" ")] a = set([int(i) for i in input().split(" ")]) b = set([int(i) for i in input().split(" ")])
sums = [] for i in arr: if i in a: sums.append(1) elif i in b: sums.append(-1) print(sum(sums))