Python

class Solution(object):
    def isPopOrder(self, pushV, popV):
        if len(pushV) != len(popV):
            return False
        stack = []
        while pushV:
            stack.append(pushV.pop(0))
            while stack and stack[-1] == popV[0]: #stack
                stack.pop()
                popV.pop(0)
        if stack:
            return False
        else:
            return True