| DNA Pattern Recognition |
Medium
|
|
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| Find Followers Count |
Easy
|
|
|
| Find Invalid IP Addresses |
Hard
|
|
|
| Find Product Recommendation Pairs |
Medium
|
|
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| Find Products with Three Consecutive Digits |
Easy
|
|
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| Find Products with Valid Serial Numbers |
Easy
|
|
|
| Find Students Who Improved |
Medium
|
|
|
| Find Valid Emails |
Easy
|
|
|
| First Letter Capitalization II |
Hard
|
|
|
| Find Circular Gift Exchange Chains |
Hard
|
|
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| Longest Team Pass Streak |
Hard
|
|
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| Team Dominance by Pass Success |
Hard
|
|
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| Analyze Organization Hierarchy |
Hard
|
|
|
| Analyze Subscription Conversion |
Medium
|
|
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| Count Employees per department |
Easy
|
|
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| Accepted Candidates From the Interviews |
Medium
|
|
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| Active Businesses |
Medium
|
yelp
|
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| All People Report to the Given Manager |
Medium
|
amazon
google
|
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| Apples & Oranges |
Medium
|
facebook
|
|
| Arrange Table by Gender |
Medium
|
|
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| Average Selling Price |
Easy
|
amazon
|
|
| Average Time of Process per Machine |
Easy
|
|
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| Biggest Window Between Visits |
Medium
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|
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| Bitwise User Permissions Analysis |
Medium
|
|
|
| Build the Equation |
Hard
|
|
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| Calculate Salaries |
Medium
|
|
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| Calculate the Influence of Each Salesperson |
Medium
|
|
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| Change Null Values in a Table to the Previous Value |
Medium
|
|
|
| Class Performance |
Medium
|
|
|
| Classifying Triangles by Lengths |
Easy
|
|
|
| Compute the Rank as a Percentage |
Medium
|
|
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| Consecutive Available Seats II |
Medium
|
|
|
| Convert Date Format |
Easy
|
|
|
| Count Student Number in Departments |
Medium
|
twitter
|
|
| Count the Number of Experiments |
Medium
|
|
|
| Create a Session Bar Chart |
Easy
|
twitch
|
|
| Customer Purchasing Behavior Analysis |
Medium
|
|
|
| Customer Who Visited but Did Not Make Any Transactions |
Easy
|
|
|
| Customers Who Bought All Products |
Medium
|
amazon
|
|
| Customers Who Bought Products A and B but Not C |
Medium
|
facebook
|
|
| Dynamic Pivoting of a Table |
Hard
|
|
|
| Employees With Deductions |
Medium
|
|
|
| Evaluate Boolean Expression |
Medium
|
point72
|
|
| Find All Unique Email Domains |
Easy
|
|
|
| Find Bursty Behavior |
Medium
|
|
|
| Find Candidates for Data Scientist Position II |
Medium
|
|
|
| Find Cities in Each State |
Easy
|
|
|
| Find Cities in Each State II |
Medium
|
|
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| Find Cutoff Score for Each School |
Medium
|
|
|
| Find Expensive Cities |
Easy
|
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