T-Systems ICT India Interview Questions and Answers

Add 2 linked lists and return final linked list

• Create a new linked list to store the sum

• Traverse both linked lists simultaneously and add the corresponding nodes

• Handle carry over while adding nodes

• If one linked list is longer than the other, add the remaining nodes to the sum list

Algorithm to maximize profit by buying and selling stocks.

• Iterate through the array of stock prices

• Keep track of the minimum price seen so far

• Calculate the profit if sold at current price

• Update maximum profit seen so far

• Return maximum profit

Finding an element in a rotated sorted array.

• Use binary search to find the pivot point where the array is rotated.

• Determine which half of the array the target element is in.

• Perform binary search on that half of the array to find the target element.

• Handle edge cases such as when the target element is at the pivot point.

CSS box model defines the layout of elements on a webpage. Padding and margin can apply to block-level elements but not to inline elements.

• CSS box model consists of content, padding, border, and margin around an element.

• Padding adds space inside the border of an element.

• Margin adds space outside the border of an element.

• Padding and margin can apply to block-level elements like <div> but not to inline elements like <span>.

JavaScript asynchronous model allows non-blocking code execution by using callbacks and promises.

• JavaScript uses an event loop to handle asynchronous operations.

• Callbacks are functions passed as arguments to other functions and executed when the operation is complete.

• Promises are objects that represent the eventual completion or failure of an asynchronous operation.

• Async/await is a newer syntax that allows writing asynchronous code in a synchronous style.

• Example: setTimeout()...read more

Arrow functions are shorter syntax for writing function expressions.

• Arrow functions do not have their own 'this' keyword.

• Arrow functions cannot be used as constructors.

• Arrow functions do not have the 'arguments' object.

• Arrow functions are more concise and easier to read.

• Regular functions are better for methods and constructors.

Given a matrix of characters and a word, find if the word exists in the matrix.

• Traverse the matrix and check if the first letter of the word matches any cell.

• If it does, check if the adjacent cells match the next letter of the word.

• Repeat until the entire word is found or no match is found.

var, let, and const are all used to declare variables in JavaScript, but they have different scoping rules and behaviors.

• var has function scope and can be redeclared and reassigned

• let has block scope and can be reassigned but not redeclared

• const has block scope and cannot be reassigned or redeclared

• Use const for values that won't change, let for values that will, and avoid var