本文实例讲述了Python实现包含min函数的栈。分享给大家供大家参考,具体如下:
# coding=utf8 ''' 题目:定义栈的数据结构,请在该类型中实现一个能够得到栈的最小元素的min函数。 在该栈中,调用min、push及pop的时间复杂度都是O(1)。 ''' class Stack(): def __init__(self): self.main_stack = [] # 辅助栈,每次次最小的元素压入辅助栈 self.assist_stack = [] # 记录栈中的最小元素 self._min = None def min(self): return self._min def push(self, data): self.main_stack.append(data) if self._min is None: self._min = data else: if data < self._min: self._min = data # 将最小的元素压入辅助栈 self.assist_stack.append(self._min) def pop(self): if len(self.main_stack) == 0: raise Exception('no data') elif len(self.main_stack) == 1: self.assist_stack.pop() self._min = None return self.main_stack.pop() else: self.assist_stack.pop() self._min = self.assist_stack[-1] return self.main_stack.pop() if __name__ == '__main__': s = Stack() s.push(3) s.push(4) s.push(2) s.push(1) print s.min() s.pop() s.pop() print s.min() s.pop() print s.min() s.pop() print s.min() s.pop()
更多关于Python相关内容可查看本站专题:《Python正则表达式用法总结》、《Python数据结构与算法教程》、《Python Socket编程技巧总结》、《Python函数使用技巧总结》、《Python字符串操作技巧汇总》、《Python入门与进阶经典教程》及《Python文件与目录操作技巧汇总》
希望本文所述对大家Python程序设计有所帮助。

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