Robina Li

You are given an integer array nums. You are initially positioned at the array’s first index, and each element in the array represents your maximum jump length at that position....

There are some spherical balloons taped onto a flat wall that represents the XY-plane. The balloons are represented as a 2D array points where points[i] = [xstart, xend] denotes a...

Given an array of intervals intervals where intervals[i] = [starti, endi], return the minimum number of intervals you need to remove to make the rest of the intervals non-overlapping.

At a lemonade stand, each lemonade costs 5. Customers are standing in a queue to buy from you and order one at a time (in the order specified by bills)....

Assume you are an awesome parent and want to give your children some cookies. But, you should give each child at most one cookie.

Android devices have a special lock screen with a 3 x 3 grid of dots. Users can set an “unlock pattern” by connecting the dots in a specific sequence, which...

You are given a string s and array queries where queries[i] = [left, right, k]. We may rearrange the substring s[left...right] and then choose up to k of its characters...

Given an integer array nums, handle multiple queries of the following type:

Given an integer array data representing the data, return whether it is a valid UTF-8 encoding (i.e., it translates to a sequence of valid UTF-8 encoded characters).

Given a 2D matrix matrix, handle multiple queries of the following types: