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class Solution(object):

def nextGreaterElement(self, findNums, nums):

"""

:type findNums: List[int]

:type nums: List[int]

:rtype: List[int]

"""

nge = {};

stack = [];

for num in nums:

while stack and stack[-1] < num:

nge[stack.pop()] = num;

stack.append(num);

return [nge.get(n, -1) for n in findNums];