Min Stack LeetCode Solution
Design a stack that supports push, pop, top, and retrieving the minimum element in constant time.
Medium
Find First and Last Position of Element in Sorted Array LeetCode Solution
Given an array of integers nums sorted in non-decreasing order, find the starting and ending position of a given target value. If target is not found in the array, return [-1, -1].
Pow(x n) LeetCode Solution
Implement pow(x, n), which calculates x raised to the power n.
Group Anagrams LeetCode Solution
Given an array of strings strs, group the anagrams together. You can return the answer in any order.
Rotate Image LeetCode Solution
You are given an n x n 2D matrix representing an image, rotate the image by 90 degrees (clockwise).
Permutations II LeetCode Solution
Given a collection of numbers, nums, that might contain duplicates, return all possible unique permutations in any order.
Jump Game II LeetCode Solution
You are given a 0-indexed array of integers nums of length n. You are initially positioned at nums[0]. Each element nums[i] represents the maximum length of a forward jump from index i. In other words, if you are at nums[i], you can jump to any nums[i + j] where: 0 <= j <= nums[i] and i + j < n. Return the minimum number of jumps to reach nums[n - 1].
Multiply Strings LeetCode Solution
Given two non-negative integers num1 and num2 represented as strings, return the product of num1 and num2, also represented as a string.
Combination Sum II LeetCode Solution
Given a collection of candidate numbers (candidates) and a target number (target), find all unique combinations in candidates where the candidate numbers sum to target.
Combination Sum LeetCode Solution
Given an array of distinct integers candidates and a target integer target, return a list of all unique combinations of candidates where the chosen numbers sum to target. You may return the combinations in any order.
Permutations LeetCode Solution
Given an array nums of distinct integers, return all the possible permutations. You can return the answer in any order.
Search in Rotated Sorted Array LeetCode Solution
Given the array nums after the possible rotation and an integer target, return the index of target if it is in nums, or -1 if it is not in nums.
Next Permutation LeetCode Solution
Given an array of integers nums, find the next permutation of nums.
Divide Two Integers LeetCode Solution
Given two integers dividend and divisor, divide two integers without using multiplication, division, and mod operator. Return the quotient after dividing dividend by divisor.
Find the Index of the First Occurrence in a String LeetCode Solution
Given two strings needle and haystack, return the index of the first occurrence of needle in haystack, or -1 if needle is not part of haystack.