【leetcode】155 - Min Stack

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【LeetCode】155. Min Stack 最小栈 (Python&C++)

作者: 负雪明烛 id: fuxuemingzhu 个人博客:http://fuxuemingzhu.cn/ 目录题目描述解题方法栈同时保存当前值和最小值辅助栈同步栈不同步栈日期题目地址:https://leetcode.com/problems/min-stack/description/ 题目描述 Design a stack that supports push, pop, top, and retrieving the minimum element in constan…

【leetcode】155 - Min Stack

Design a stack that supports push, pop, top, and retrieving the minimum element in constant time. push(x) -- Push element x onto stack. pop() -- Removes the element on top of the stack. top() -- Get the top element. getMin() -- Retrieve the minimum e…

【一天一道LeetCode】#155. Min Stack

一天一道LeetCode 本系列文章已全部上传至我的github,地址:ZeeCoder's Github 欢迎大家关注我的新浪微博,我的新浪微博欢迎转载,转载请注明出处 (一)题目 Design a stack that supports push, pop, top, and retrieving the minimum element in constant time. push(x) – Push element x onto stack. pop() – Removes the el…

【leetcode❤python】 155. Min Stack

#-*- coding: UTF-8 -*- class MinStack(object): def __init__(self): """ initialize your data structure here. """ self.Stack=[] self.minStack=[] def push(self, x): "&…

【原创】leetCodeOj --- Min Stack 解题报告

题目地址: https://oj.leetcode.com/problems/min-stack/ 题目内容: Design a stack that supports push, pop, top, and retrieving the minimum element in constant time. push(x) -- Push element x onto stack. pop() -- Removes the element on top of the stack. top() --…

LeetCode题解 #155 Min Stack

写一个栈,支持push pop top getMin 难就难在在要在常量时间内返回最小的元素. 一开始乱想了很多东西,想到了HashMap,treeMap,堆什么的,都被自己一一否决了. 后来想到其实用一个栈来记录当前的最小值就好了,只有当被删除的元素等于min栈的栈顶元素时,才删除min栈里面的元素. min栈中每个元素代表着那一段栈中的最小值了. // stack: store the stack numbers private Stack<Integer> stack = new Sta…

【Leetcode】746. Min Cost Climbing Stairs

题目地址: https://leetcode.com/problems/min-cost-climbing-stairs/description/ 解题思路: 官方给出的做法是倒着来,其实正着来也可以,无非就是进入某个step有两种方式,退出某一个 step也有两种方式,因此若用dp[i]表示进入第i步并预计从这里退出的最小值,dp[i] = cost[i] + min(dp[i-1],dp[i-2]) 最后求退出时最小值,min(dp[i-1],dp[i]) 真正写代码时不必用数组记录dp,用…