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全部文章（共118篇）

53 Lucky Numbers in a Matrix

题目 Given a m * n matrix of distinct numbers, return all lucky numbers in the matrix in any order. A lucky number is an element of the matrix such th...

2020-03-18

0 485

复杂sql记录

灵感来了也记不住，在这里记录一下一些sql查询，方便以后复制粘贴往角色为st_admin的用户的user_msg表中插入一条记录。难点：角色为st_admin的用户个数不定 <insert id="sendMsgToRole"> insert in...

2020-03-17

0 505

52 Generate a String With Characters That Have Odd Counts

题目 Given an integer n, return a string with n characters such that each character in such string occurs an odd number of times. The returned string ...

2020-03-17

0 479

51 Sort the Matrix Diagonally

题目分析题意：给一个m*n矩阵，按对角线进行升序排序。将矩阵下标标出来解题关键在于如何找到“对角线”。我们人是可以直观看出来的，但是计算机不能。通过观察发现，<mark>对角线的元素必有：i-j相同</mark>。根据这个特性，实现对角遍历，将每个对...

2020-03-16

0 499

50 Maximum Binary Tree

题目 Given an integer array with no duplicates. A maximum tree building on this array is defined as follow: The root is the maximum number in the arra...

2020-03-15

0 495

49 Encode and Decode TinyURL

题目 Note: This is a companion problem to the System Design problem: Design TinyURL. TinyURL is a URL shortening service where you enter a URL such a...

2020-03-14

0 657

48 Insert into a Binary Search Tree

题目 Given the root node of a binary search tree (BST) and a value to be inserted into the tree, insert the value into the BST. Return the root node of...

2020-03-13

0 384

47 Find a Corresponding Node of a Binary Tree in a Clone of That Tree

题目 Given two binary trees original and cloned and given a reference to a node target in the original tree. The cloned tree is a copy of the original...

2020-03-12

0 558

46 Count Negative Numbers in a Sorted Matrix

题目 Given a m * n matrix grid which is sorted in non-increasing order both row-wise and column-wise. Return the number of negative numbers in grid. ...

2020-03-11

0 427

45 Increasing Decreasing String

题目 Given a string s. You should re-order the string using the following algorithm: Pick the smallest character from s and append it to the result. P...

2020-03-10

0 521