Problem Summary You are given an integer array nums and two integers minK and maxK. A fixed-bounds subarray is a subarray that satisfies: Your task is to count how many such subarrays exist. ExampleInput: Valid fixed-bound subarrays: Output: Constraints Approach (Simple English) We must count subarrays where: A naive O(n²) approach is too slow. We…

Problem Summary You are given an integer array differences and two integers lower and upper. There exists a hidden array nums of length n = differences.length + 1 such that: Your task is to return how many possible hidden arrays nums exist such that every element in nums is within the inclusive range: If no…

Problem Summary You are given an integer array answers, where each answers[i] represents: A rabbit says:“There are answers[i] other rabbits that have the same color as me.” Your task is to compute the minimum number of rabbits that could be in the forest. ExampleInput: answers = [1, 1, 2]Output: 5Explanation: ExampleInput: answers = [10, 10,…

Problem Summary The count-and-say sequence is defined as follows: For example: Your task:Given an integer n, return the nth term of this sequence as a string. Constraints1 ≤ n ≤ 30 Understanding the Sequence List of first few terms: Each term depends only on the previous term. Approach (Simple English) To generate the nth term:…

Problem Summary You are given an integer array nums and an integer k. In one operation, you may choose any element and add or subtract any positive integer from it, but the cost of the operation equals the amount you add or subtract. Your task is to compute the minimum total cost needed so that…

Problem Summary You are given an integer array nums.In one operation, you may increment or decrement any element by exactly 1. Your task is to compute the minimum number of operations required to make all elements in the array distinct. ExampleInput: Output: Explanation: You can change the last 2 to 3 using 1 operation, resulting…

Problem Summary You are given an integer array nums.Your task is to determine whether the array can be partitioned into two subsets such that the sum of elements in both subsets is equal. ExampleInput: nums = [1,5,11,5]Output: trueExplanation: The array can be split into [1,5,5] and [11]. Input: nums = [1,2,3,5]Output: falseExplanation: Equal partition is…

Problem Summary You are given an integer array nums.Your task is to compute the sum of XOR of every possible subset of nums. Formally:For all subsets S of the array, computexor(S)and return the sum of all these values. ExampleInput: nums = [1,3]Subsets are:[] -> 0[1] -> 1[3] -> 3[1,3] -> 1 ^ 3 = 2Sum…

Problem Summary You are given the root of a binary tree.Your task is to return the lowest common ancestor (LCA) of all the tree’s deepest leaves. A deepest leaf is any node that has the maximum depth in the entire tree. ExampleInput: Deepest leaf is 4, so the answer is node 4. Another example: Deepest…