Robina Li

Given a positive integer n, you can add or subtract any power of 2 in one operation. Return the minimum number of operations to reduce n to 0.

Given a string s, return the number of non-empty good subsequences of s. A subsequence is good if every character in it appears the same number of times. Answer modulo...

Given an m x n binary matrix filled with '0's and '1's, find the largest square containing only '1's and return its area.

Given an m x n integers matrix, return the length of the longest strictly increasing path.

Given an array of integers citations where citations[i] is the number of citations a researcher received for their i-th paper, return the researcher’s h-index.

Given the head of a singly linked list and two integers left and right where left <= right, reverse the nodes of the list from position left to position right...

You are given two linked lists: list1 and list2 of sizes n and m respectively. Remove list1’s nodes from the a-th node to the b-th node (0-indexed), and put list2...

You are given an array of events where events[i] = [startDay, endDay]. You can attend an event on any single day in the range [startDay, endDay]. You can only attend...

Given an integer n, return a list of all possible full binary trees with n nodes. Each node has value 0. A full binary tree is a tree where every...

Given an array nums, find two indices i and j (i != j) such that the digit sum of nums[i] equals the digit sum of nums[j], and return the maximum...