随笔分类 - leetcode
https://leetcode.com/problemset/all/
摘要：Find the minimum length word from a given dictionary words, which has all the letters from the string licensePlate. Such a word is said to complete th
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摘要：On a N N grid, we place some 1 1 1 cubes. Each value v = grid[i][j] represents a tower of v cubes placed on top of grid cell (i, j). Return the total
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摘要：A sentence S is given, composed of words separated by spaces. Each word consists of lowercase and uppercase letters only. We would like to convert the
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摘要：Design a HashMap without using any built in hash table libraries. To be specific, your design should include these functions: put(key, value) : Insert
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摘要：We are given two strings, A and B. A shift on A consists of taking string A and moving the leftmost character to the rightmost position. For example,
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摘要：X is a good number if after rotating each digit individually by 180 degrees, we get a valid number that is different from X. Each digit must be rotate
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摘要：Given a Binary Search Tree (BST) with the root node root, return the minimum difference between the values of any two different nodes in the tree. Exa
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摘要：Given a Binary Search Tree (BST), convert it to a Greater Tree such that every key of the original BST is changed to the original key plus sum of all
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摘要：Given a string S, we can transform every letter individually to be lowercase or uppercase to create another string. Return a list of all possible stri
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摘要：Give a string s, count the number of non empty (contiguous) substrings that have the same number of 0's and 1's, and all the 0's and all the 1's in th
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摘要：Given a word, you need to judge whether the usage of capitals in it is right or not. We define the usage of capitals in a word to be right when one of
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摘要：Given a Weather table, write a SQL query to find all dates' Ids with higher temperature compared to its previous (yesterday's) dates. + + + + | Id(INT
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摘要：Write a SQL query to find all duplicate emails in a table named Person. + + + | Id | Email | + + + | 1 | a@b.com | | 2 | c@d.com | | 3 | a@b.com | + +
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摘要：Given a non negative integer number num. For every numbers i in the range 0 ≤ i ≤ num calculate the number of 1's in their binary representation and r
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摘要：Given a non empty, singly linked list with head node head, return a middle node of linked list. If there are two middle nodes, return the second middl
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摘要：Given an n ary tree, return the postorder traversal of its nodes' values. For example, given a 3 ary tree: Return its postorder traversal as: [5,6,3,2
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摘要：We are to write the letters of a given string S, from left to right into lines. Each line has maximum width 100 units, and if writing a letter would c
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摘要：Given a string, you need to reverse the order of characters in each word within a sentence while still preserving whitespace and initial word order. E
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摘要：Calculate the sum of two integers a and b, but you are not allowed to use the operator + and . Example 1: Input: a = 1, b = 2 Output: 3 Example 2: Inp
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摘要：Write a program that outputs the string representation of numbers from 1 to n. But for multiples of three it should output “Fizz” instead of the numbe
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