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Climbing Stairs LeetCode Solution

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You are climbing a staircase. It takes n steps to reach the top. Each time you can either climb 1 or 2 steps. In how many distinct ways can you climb to the top?

Reverse Linked List LeetCode Solution

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Given the head of a singly linked list, reverse the list, and return the reversed list.

Delete Node in a Linked List LeetCode Solution

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There is a singly-linked list head and we want to delete a node node in it. Delete the given node

Add Digits LeetCode Solution

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Given an integer num, repeatedly add all its digits until the result has only one digit, and return it.

Nim Game LeetCode Solution

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Given n, the number of stones in the heap, return true if you can win the game assuming both you and your friend play optimally, otherwise return false.

Merge k Sorted Lists LeetCode Solution

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You are given an array of k linked-lists lists, each linked-list is sorted in ascending order. Merge all the linked-lists into one sorted linked-list and return it.

Majority Element LeetCode Solution

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Given an array nums of size n, return the majority element. The majority element is the element that appears more than [n / 2] times. You may assume that the majority element always exists in the array.

3Sum LeetCode Solution

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Given an integer array nums, return all the triplets [nums[i], nums[j], nums[k]] such that i != j, i != k, and j != k, and nums[i] + nums[j] + nums[k] == 0.

Median of Two Sorted Arrays LeetCode Solution

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Given two sorted arrays nums1 and nums2 of size m and n respectively, return the median of the two sorted arrays. The overall run time complexity should be O(log (m+n)).

Longest Substring Without Repeating Characters LeetCode Solution

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Given a string s, find the length of the longest substring without repeating characters.

Add Two Numbers LeetCode Solution

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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 contains a single digit. Add the two numbers and return the sum as a linked list.

Two Sum LeetCode Solution

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Given an array of integers nums and an integer target, return indices of the two numbers such that they add up to target. You may assume that each input would have exactly one solution, and you may not use the same element twice.