Python / Data Structures
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Code Problem / Data Structures and Algorithms / Recursion (32)
Code Problem / Data Structures and Algorithms / Binary Search (30)
Code Problem / Data Structures and Algorithms / Linked Lists (26)
Code Problem / Data Structures and Algorithms / Backtracking (26)
Code Problem / Data Structures and Algorithms / Stacks and Queues (25)
Code Problem / Data Structures and Algorithms / Hashing (24)
Databases / SQL / Backup and Recovery (19)
Code Problem / Data Structures and Algorithms / Arrays and Strings (19)
Databases / SQL / Database Normalization (18)
Code Problem / Data Structures and Algorithms / Time Complexity (17)
Databases / SQL / Locking (16)
Databases / SQL / Replication (15)
Databases / SQL / SQL Queries (13)
Code Problem / Data Structures and Algorithms / Graphs (13)
Databases / SQL / Database Security (13)
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Given a list of integers, this function will return a dictionary with the integers as keys and the number of times the integer appears in the list as values.
About this solution: This solution is complete and solves the problem. The approach is straightforward and easy to follow.
The function should take a list of integers as input and return the sum of the integers in the list that are divisible by 3.
About this solution: The candidate's solution correctly returns the sum of the integers in the list that are divisible by 3. The candidate has used a for loop to iterate through the list and check if each integer is divisible by 3. If it is, the integer is added to the sum. This is a valid approach to solving the problem.
This technical problem deals with finding the sum of all the elements in a list of integers. An example input would be [1, 2, 3, 4, 5], and the corresponding output would be 15.
About this solution: This solution is complete and solves the problem. The approach is straightforward and easy to understand.
The problem is to find the indices of two numbers in a list of integers that add up to a given target value. An example input would be [2, 7, 11, 15] with a target value of 9, and the expected output would be [0, 1].
About this solution: The candidate's solution is complete and solves the problem. The candidate's approach is to create a dictionary to store the difference between the target and the current number as the key and the index of the current number as the value. If the current number is in the dictionary, the candidate returns the index of the current number and the value of the key. Otherwise, the candidate adds the difference between the target and the current number as the key and the index of the current number as the value.
The technical problem is to write a Python script to return a dictionary containing the count of each unique integer in a given list. For example, given the list [1, 2, 1, 2, 1, 3, 3, 3, 4, 4, 4, 4], the expected output would be {1: 3, 2: 2, 3: 3, 4: 4}.
About this solution: The candidate's solution correctly solves the problem and is fairly straightforward. However, it could be more concise. For example, the candidate could use a defaultdict instead of a regular dictionary, which would eliminate the need for the initial if statement. Additionally, the candidate could use a Counter object from the collections module, which would make the solution even more concise.
This problem asks you to write a function that takes a list of integers and returns a dictionary with the integers as keys and the number of times they appear in the list as values.
About this solution: The candidate's solution correctly solves the problem and is reasonably complete. The candidate uses a dictionary to keep track of the number of times each integer appears in the list, which is a good approach.
To calculate the sum of values in a dataframe column in Python, simply use the sum() function on the column. In the example given, the sum of values in column 'C' would be 24.
About this solution: The candidate's solution is correct and efficient.
This problem asks for the sum of the absolute values of a given list of integers. For example, given the list [2, -4, 6, -8], the sum of the absolute values would be 20.
About this solution: This solution is correct and demonstrates a good understanding of time complexity.