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Given an array of integers nums.
A pair (i,j) is called good if nums[i] == nums[j] and i < j.
Return the number of good pairs.
暴力破解：
class Solution:
def numIdenticalPairs(self, nums: List[int]) -> int:
count=0
for x in range(len(nums)):
for y in range(x+1,len(nums)):
if nums[x]==nums[y]:
count+=1
return count
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