Example 2 Can you solve this real interview question? 3Sum - Given an integer array nums, return all the triplets [nums[i], nums[j], nums[k]] such that i != j, i != k, and j 1. The testcases will be generated such that the answer is unique. Level up your coding skills and quickly land a job. Given n non-negative integers representing an elevation map where the width of each bar is 1, compute how much water it can trap after raining. Level up your coding skills and quickly land a job. Can you solve this real interview question? Minimum Window Substring - Given two strings s and t of lengths m and n respectively, return the minimum window substring of s such that every character in t (including duplicates) is included in the window. The list should be made by splicing together the nodes of the first two lists. This is the best place to expand your knowledge and get prepared for your next interview. You are given the heads of two sorted linked lists list1 and list2. 3. If there is no such substring, return the empty string "". 2. Example 1: Input: s Level up your coding skills and quickly land a job. No matter if you are a beginner or a master, there are always new topics waiting for you to explore. Enhance your coding abilities and get valuable real-world feedback by participating in contests on LeetCode. If you'd like to share your solution for feedback and ideas, please head to the solutions tab and post it there. The problem discussion is for asking questions about the problem or for sharing tips - anything except for solutions. You can also win up to 5000 LeetCoins per contest, as well as bonus prizes from sponsored companies. Please don't post any solutions in this discussion. LeetCode Explore is the best place for everyone to start practicing and learning on LeetCode. Example 1: Input: s . Example 1: Input: list1 = [1,2,4], list2 = [1,3,4] Output: [1,1,2,3,4,4] Example 2: Input: list1 = [], list2 = [] Output: [] Example 3: Input: list1 = [], list2 Level up your coding skills and quickly land a job. In this case, 6 units of rain water (blue section) are being trapped. Example 1: Input: height = [0,1,0,2,1,0,1,3,2,1,2,1] Output: 6 Explanation: The above elevation map (black section) is represented by array [0,1,0,2,1,0,1,3,2,1,2,1]. Return the head of the merged linked list. Merge the two lists into one sorted list.

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