u012365383的专栏

QuestionValidate if a given string is numeric.Some examples:"0" => true" 0.1 " => true"abc" => false"1 a" => false"2e10" => trueNote: It is intended for the problem statement t

QuestionDetermine if a Sudoku is valid, according to: Sudoku Puzzles - The Rules.The Sudoku board could be partially filled, where empty cells are filled with the character '.'.A par

QuestionGiven an array of integers, find two numbers such that they add up to a specific target number.The function twoSum should return indices of the two numbers such that they add up to the

QuestionMerge two sorted linked lists and return it as a new list. The new list should be made by splicing together the nodes of the first two lists.My Solution/** * Definition for singly-l

QuestionA message containing letters from A-Z is being encoded to numbers using the following mapping:'A' -> 1'B' -> 2...'Z' -> 26Given an encoded message containing digits, determin

QuestionImplement int sqrt(int x).Compute and return the square root of x.My Solutionclass Solution {public: int mySqrt(int x) { /** * binary search a from [0, x], where a^2 = x.

QuestionGiven a string s and a dictionary of words dict, add spaces in s to construct a sentence where each word is a valid dictionary word.Return all such possible sentences.For example

QuestionGiven a string s and a dictionary of words dict, determine if s can be segmented into a space-separated sequence of one or more dictionary words.For example, givens = "leetcode",

QuestionGiven a binary search tree, write a function kthSmallest to find the kth smallest element in it.Note: You may assume k is always valid, 1 ≤ k ≤ BST's total elements.Follow up