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Description https://leetcode.com/problems/find-k-length-substrings-with-no-repeated-characters/ Given a string s, return the number of substrings of length k with no repeated characters. Example 1: Input: s =…
Description https://leetcode.com/problems/rotting-oranges/ You are given an m x n grid where each cell can have one of three values: 0 representing an empty cell,…
Description https://leetcode.com/problems/arithmetic-slices/ An integer array is called arithmetic if it consists of at least three elements and if the difference between any…
Description https://leetcode.com/problems/time-based-key-value-store/ Design a time-based key-value data structure that can store multiple values for the same key at different time…
Description https://leetcode.com/problems/concatenation-of-array/ Given an integer array nums of length n, you want to create an array ans of length 2n where ans[i] == nums[i] and ans[i + n] == nums[i] for 0…
Description https://leetcode.com/problems/random-pick-index/ Given an integer array nums with possible duplicates, randomly output the index of a given target number. You can assume that the given…
Description https://leetcode.com/problems/populating-next-right-pointers-in-each-node-ii/ Given a binary tree struct Node { int val; Node *left; Node *right; Node *next; } Populate each…
Description https://leetcode.com/problems/build-array-from-permutation/ Given a zero-based permutation nums (0-indexed), build an array ans of the same length where ans[i] = nums[nums[i]] for each 0 <= i < nums.length and return it. A zero-based…
Description https://leetcode.com/problems/find-median-from-data-stream/ The median is the middle value in an ordered integer list. If the size of the list is even, there…
Description https://leetcode.com/problems/reorder-list/ You are given the head of a singly linked-list. The list can be represented as: L0 → L1…