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Write a function to find the longest common prefix string amongst an array of strings. 找出字符串数组中最长的公共前缀。 思路：将字符串数组中每个字符串左对齐，排成一列，然后依次对比每个字符串的相同位置的字母。 如 阅读全文
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Given a string s consists of upper/lower-case alphabets and empty space characters ' ', return the length of last word in the string. If the last word 阅读全文
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Given a non-empty string s, you may delete at most one character. Judge whether you can make it a palindrome. Example 1: Example 2: Note: 判断最多去掉一个字母后回 阅读全文
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信号槽是Qt的核心机制之一，信号槽简单的来说就是两个对象及两个对象问答行为。 例如：发送者（Sender）发出信号（SIGNAL）、接收者（Receiver）做出反应（SLOT）。利用connect函数将这两个对象及其行为联系起来。 一个简单的例子如下，创建一个button，Clicked butt 阅读全文
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Given a (singly) linked list with head node root, write a function to split the linked list into k consecutive linked list "parts". The length of each 阅读全文
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Given an array of integers nums, write a method that returns the "pivot" index of this array. We define the pivot index as the index where the sum of 阅读全文
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Given two sorted integer arrays nums1 and nums2, merge nums2 into nums1 as one sorted array. Note:You may assume that nums1 has enough space (size tha 阅读全文
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Given two strings A and B, find the minimum number of times A has to be repeated such that B is a substring of it. If no such solution, return -1. For 阅读全文
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Given a non-negative integer c, your task is to decide whether there're two integers a and b such that a2 + b2 = c. Example 1: Input: 5 Output: True E 阅读全文
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Given a C++ program, remove comments from it. The program source is an array where source[i] is the i-th line of the source code. This represents the 阅读全文