UBank Interview Questions and Answers

Hackerank test. Leetcode Medium

Q1. Minimum time required to paint all boards
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Q2. Check if binary tree is bst
Ans. 
Check if binary tree is BST by performing inorder traversal and checking if the elements are in sorted order.
• Perform inorder traversal of the binary tree

• Check if the elements are in sorted order

• If any element is not in sorted order, then the binary tree is not a BST
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Q3. Second largest element in sql
Ans. 
Use SQL query with ORDER BY and LIMIT to find the second largest element in a table.
• Use ORDER BY clause to sort the elements in descending order.

• Use LIMIT 1,1 to retrieve the second row after skipping the first row.

• Example: SELECT column_name FROM table_name ORDER BY column_name DESC LIMIT 1,1;
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Q1. Steps required by a knight from source to destination
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A knight moves in an L-shape pattern, requiring 2.5 steps to reach any square on a chessboard.
• Move 2 squares in one direction and 1 square in a perpendicular direction

• The knight can move in 8 different directions from any square on the board

• Example: From A1 to C2, the knight moves 2 squares right and 1 square up
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