Code Problem
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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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This problem asks whether a given singly linked list is a palindrome. A palindrome is a word, phrase, or sequence that reads the same backward as forward. In this case, the list is a palindrome if the elements in the list read the same forward as backward.
About this solution: The candidate's solution correctly checks if a singly linked list is a palindrome. The approach is to use a slow and fast pointer to find the middle of the list, reverse the second half of the list, and then compare the two halves.
One potential improvement to the solution would be to use a stack to keep track of the first half of the list instead of reversing the second half. This would avoid having to reverse the second half of the list, which is unnecessary work.
This problem requires the use of a binary search algorithm to find a target value in a sorted array. If the target value is found, the index of that value is returned. If the target value is not found, -1 is returned.
About this solution: The candidate's solution is complete and solves the problem. The candidate uses a binary search, which is the most efficient way to search a sorted array.
This problem involves searching for a given value in a sorted array of integers. If the value is found, the index of the target value is returned; if not, -1 is returned.
About this solution: The candidate's solution is correct and demonstrates a level of completeness. The candidate has correctly identified the problem and has provided a solution that solves the problem. The candidate's approach is general and uses a binary search algorithm, which is the optimal solution for this problem.
This problem involves searching for a given value in a sorted array of integers. If the value is found, the index of the target value is returned; if not, -1 is returned.
About this solution: The candidate's solution does not demonstrate a level of completeness and does not solve the problem. The general approach is not clear.
Given a 2D array of integers, this problem looks for the longest path from the top left to the bottom right where each step only visits cells with values greater than or equal to the current cell.
About this solution: The candidate's solution is complete and solves the problem. The approach is to use dynamic programming. The idea is to create a 2D array of the same size as the input array. The value of each cell in the 2D array is the length of the longest path from the top left to that cell. The value of the top left cell is 1. The value of the other cells is the maximum of the value of the cell above and the value of the cell to the left, plus 1. The value of the bottom right cell is the length of the longest path. The time complexity is O(n^2) and the space complexity is O(n^2).