Given n non-negative integers representing the histogram’s bar height where the width of each bar is 1, find the area of largest rectangle in the histogram.算法： 1. if height[i]>=stack.peek(), push 2.

Implement the following operations of a stack using queues.push(x) -- Push element x onto stack. pop() -- Removes the element on top of the stack. top() -- Get the top element. empty() -- Return whethe

Given an absolute path for a file (Unix-style), simplify it.For example, path = “/home/”, => “/home” path = “/a/./b/../../c/”, => “/c”corner case: "/a//b", "" 开始把/.. 理解错了…. /a/b/.. = /a, /../../