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.Example :Input: root = [4,2,6,1,3,null,null] Output: 1... 阅读全文
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Given a string s, find the longest palindromic substring in s. You may assume that the maximum length of s is 1000.Example:Input: "babad" Output: "bab" Note: "aba" is also a valid answer. Example:I... 阅读全文
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Given an integer, convert it to a roman numeral.Input is guaranteed to be within the range from 1 to 3999.1234567891011121314151617181920212223242526class Solution: def intToRoman(self, num): ... 阅读全文
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Given a string, find the length of the longest substring without repeating characters.Examples:Given "abcabcbb", the answer is "abc", which the length is 3.Given "bbbbb", the answer is "b", with ... 阅读全文
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Given a list of 24-hour clock time points in "Hour:Minutes" format, find the minimum minutes difference between any two time points in the list.Example 1:Input: ["23:59","00:00"] Output: 1 Note:The nu... 阅读全文
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Given two non-negative integers num1 and num2 represented as strings, return the product of num1 and num2.Note:The length of both num1 and num2 is < 110.Both num1 and num2 contains only digits 0-9.Bot... 阅读全文
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You are given two non-empty linked lists representing two non-negative integers. The most significant digit comes first and each of their nodes contain a single digit. Add the two numbers and return i... 阅读全文
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You are given two non-empty linked lists representing two non-negative integers. The digits are stored in reverse order and each of their nodes contain a single digit. Add the two numbers and return i... 阅读全文
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Given a string representing an expression of fraction addition and subtraction, you need to return the calculation result in string format. The final result should be irreducible fraction. If your fin... 阅读全文
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Given a non-negative integer n, count all numbers with unique digits, x, where 0 ≤ x < 10n.Example: Given n = 2, return 91. (The answer should be the total numbers in the range of 0 ≤ x < 100, excludi... 阅读全文