摘要：
Given a sorted integer array without duplicates, return the summary of its ranges. Example 1: Example 2: 题目标签：Array 题目给了我们一个nums array， 让我们找出它的区间总结。 这 阅读全文
摘要：
Given an array of integers and an integer k, find out whether there are two distinct indices i and j in the array such that nums[i] = nums[j] and the 阅读全文
摘要：
Given an array of integers, find if the array contains any duplicates. Your function should return true if any value appears at least twice in the arr 阅读全文
摘要：
Find all possible combinations of k numbers that add up to a number n, given that only numbers from 1 to 9 can be used and each combination should be 阅读全文