1441. 用栈操作构建数组-简单

class Solution(object):
    def buildArray(self, target, n):
        lis = []
        k = 0
        for i in range(1,n+1):
            if k < len(target):
                if i == target[k]:
                    lis.append("Push")
                    k = k + 1
                else:
                    lis.append("Push")
                    lis.append("Pop")
        return lis