1426. Counting Elements
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class Solution:
def countElements(self, arr: List[int]) -> int:
cnt = Counter(arr)
return sum(v for x, v in cnt.items() if cnt[x + 1])
class Solution:
def countElements(self, arr: List[int]) -> int:
cnt = Counter(arr)
return sum(v for x, v in cnt.items() if cnt[x + 1])