JEN-LI CHEN IN DATA SCIENCE

Leetcode

39. Combination Sum

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.

Leetcode

21. Merge Two Sorted Lists

Merge two sorted linked lists and return it as a sorted list. The list should be made by…

Leetcode

360. Sort Transformed Array

Given a sorted integer array nums and three integers a, b and c, apply a quadratic function of the form f(x) = ax2 + bx + c to each element nums[i] in the array, and return the array in a sorted order.

Leetcode

1196. How Many Apples Can You Put into the Basket

You have some apples, where arr[i] is the weight of the i-th apple. You also have a basket that can carry up to 5000 units of weight.

HackerRank Python

Capitalize!

You are asked to ensure that the first and last names of people begin with a capital letter in their passports. For example, alison heck should be capitalised correctly as Alison Heck.

HackerRank Python

Nested Lists

Given the names and grades for each student in a class of students N, store them in a nested list and print the name(s) of any student(s) having the second lowest grade.

Leetcode SQL

262. Trips and Users

Table: Trips

+-------------+----------+
| Column Name | Type     |
+-------------+----------+
| Id          | int      |
| Client_Id   | int      |
| Driver_Id   | int      |
| City_Id     | int      |
| Status      | enum     |
|…

Write a function

An extra day is added to the calendar almost every four years as February 29, and the day is called a leap day. It corrects the calendar for the fact that our planet takes approximately 365.25 days to orbit the sun. A leap year contains a leap day.

ginortS

You are given a string S.
S contains alphanumeric characters only.

Your task is to sort the string S in the following manner:

• All sorted lowercase letters are ahead of uppercase letters.
• All sorted uppercase…