作者: 负雪明烛 id: fuxuemingzhu 个人博客: http://fuxuemingzhu.cn/ 公众号:负雪明烛 本文关键词:字形变换,ZigZag,题解,Leetcode, 力扣,Python, C++, Java 目录 题目描述 题目大意 解题方法 公式 日期 题目地址:https://leetcode.com/problems/zigzag-conversion/description/ 题目描述 The string "PAYPALISHIRING" is wr…

The string "PAYPALISHIRING" is written in a zigzag pattern on a given number of rows like this: (you may want to display this pattern in a fixed font for better legibility) P A H N A P L S I I G Y I R And then read line by line: "PAHNAPLSII…

The string "PAYPALISHIRING" is written in a zigzag pattern on a given number of rows like this: (you may want to display this pattern in a fixed font for better legibility) P A H N A P L S I I G Y I R And then read line by line: "PAHNAPLSII…

题目: 思路: 以图为例:s={'A','B','C','D','E','F','G','H'.....} 1.先不考虑中间元素F.G.H.N...,每一行前后元素在数组中对应下标相差size=2*numRows-2(其中numRows是行数) 例如:第1行起始元素s[0]=A,在不大于数组长度情况下,size=2*5-2=8,该行往后依次是s[0+8]=s[8],s[0+8+8]=s[16]..... 2.考虑加入中间元素,j表示当前元素所在数组的下标,i为该元素所在行(从0开始),则除第一行…

一天一道LeetCode系列 (一)题目 The string "PAYPALISHIRING" is written in a zigzag pattern on a given number of rows like this: (you may want to display this pattern in a fixed font for better legibility) P A H N A P L S I I G Y I R And then read line by l…

作者: 负雪明烛 id: fuxuemingzhu 个人博客:http://fuxuemingzhu.cn/ 目录 题目描述 题目大意 解题方法 deque 日期 题目地址:https://leetcode-cn.com/problems/zigzag-iterator/ 题目描述 Given two 1d vectors, implement an iterator to return their elements alternately. Example: Input: v1 = [1,2]…

[LeetCode]Minimum Depth of Binary Tree Given a binary tree, find its minimum depth. The minimum depth is the number of nodes along the shortest path from the root node down to the nearest leaf node. 递归和非递归,此提比较简单.广度优先遍历即可.关键之处就在于如何保持访问深度. 下面是4种代码: im…

Given an index k, return the kth row of the Pascal's triangle. For example, given k = 3, Return [1,3,3,1]. Note: Could you optimize your algorithm to use only O(k) extra space? 思路:最简单的方法就是依照[Leetcode]Pascal's Triangle 的方式自顶向下依次求解,但会造成空间的浪费.若仅仅用一个vect…

53. Maximum Subarray[leetcode] Find the contiguous subarray within an array (containing at least one number) which has the largest sum. For example, given the array [-2,1,-3,4,-1,2,1,-5,4],the contiguous subarray [4,-1,2,1] has the largest sum = 6. 挑…

27. Remove Element[leetcode] Given an array and a value, remove all instances of that value in place and return the new length. Do not allocate extra space for another array, you must do this in place with constant memory. The order of elements can b…