Given a binary tree containing digits from 0-9 only, each root-to-leaf path could represent a number. An example is the root-to-leaf path 1-> ...

题目: You are given two linked lists representing two non-negative numbers. The digits are stored in reverse order and each of their nodes contain ...

Given a positive integer `N`, how many ways can we write it as a sum of consecutive positive integers? Example 1: Example 2: Example ...

Given a non-negative integer c, your task is to decide whether there're two integers a and b such ...

the sum of zero. Note: Elements in a triplet (a,b,c) ...

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

which gives the sum of target. Note: Elements ...

题目： Given a set of candidate numbers (C) and a target number (T), find all unique combinations in C where the candidate numbers sums to T. ...