Goodmaysys Software Technologies Pvt Ltd | Software Development Company Interview Questions and Answers

The task is to find the next greater element for each element in an array to its right, if no greater element exists, return -1.

• Iterate through the array from right to left and use a stack to keep track of elements.

• Pop elements from the stack until a greater element is found or the stack is empty.

• Store the next greater element for each element in the output array.

Count substrings with exactly K distinct characters in a given lowercase string.

• Iterate through all substrings of the given string and count the number of distinct characters in each substring.

• Keep track of substrings with exactly K distinct characters and increment the count.

• Return the total count of substrings with exactly K distinct characters.

Use JavaScript to switch on and off a bulb with one button.

• Create a variable to store the state of the bulb (on/off)

• Add an event listener to the button

• Toggle the state of the bulb variable on each button click

• Update the bulb image or class based on the state of the bulb variable

To create a table using HTML, color one row, and merge specific columns, use <table>, <tr>, <td>, and <th> tags with CSS styling.

• Create a table using <table>, <tr>, <td>, and <th> tags

• Color one row using CSS by targeting the <tr> element with a specific class or inline style

• Merge specific columns using the colspan attribute in the <td> or <th> tags

Join in SQL is used to combine data from two or more tables based on a related column between them.

• Types of joins: Inner join, Left join, Right join, Full outer join, Cross join

• Syntax: SELECT * FROM table1 JOIN table2 ON table1.column = table2.column

• Example: SELECT * FROM customers JOIN orders ON customers.customer_id = orders.customer_id