Associate Software Engineer

Find the next number in the series:
2, 6, 12, 20, 30, ?

Pointing to a man in a photo, Rina said, “He is the only son of my father’s wife.” How is Rina related to the man?

Statements: 
All cats are animals. 
Some animals are dogs. 

Conclusion: 
(I) Some cats are dogs. 
(II) All cats are dogs.

A person walks 5 km North, then turns right and walks 3 km, then turns right again and walks 5 km. Which direction is he facing now?

In a code language, if TREE is coded as USFF, how is PLAN coded?

Three people need to cross a bridge at night. They have one torch, and at most two people can cross at a time. They take 1, 2, and 5 minutes respectively. What's the minimum time to get all three across?

You’re outside a room with 3 switches. One of them controls a bulb inside the room. You can only enter the room once. How do you find out which switch controls the bulb?

You have 8 balls, one of which is slightly heavier. You can use a balance scale only twice. How do you find the heavier ball?

You have a 7-minute and 4-minute hourglass. How can you measure exactly 9 minutes?

What will be the output of the following C code?

#include

int mystery(int arr[], int size) {
   int i, result = 0;
   for(i = 0; i < size; i++) {
       result ^= arr[i];
   }
   return result;
}

int main() {
   int data[] = {5, 3, 5, 4, 3};
   int size = sizeof(data) / sizeof(data[0]);
   printf("Result: %d\n", mystery(data, size));
   return 0;
}

Write a function that takes a list of strings and returns the longest common prefix shared among all strings.
If there is no common prefix, return an empty string.

Example:
Input: ["flower", "flow", "flight"]  
Output: "fl"

Input: ["dog", "racecar", "car"]  
Output: ""

Given an array of positive integers and a target sum, find the starting and ending indices of the subarray that adds up to the given sum. Return -1 if no such subarray exists.

Example:
Input: arr[] = {1, 4, 20, 3, 10, 5}, sum = 33  
Output: Subarray found from index 2 to 4

Input: arr[] = {1, 4, 0, 0, 3, 10, 5}, sum = 7  
Output: Subarray found from index 1 to 4

What is the difference between DELETE, TRUNCATE, and DROP? (Learn)

What is indexing? How does it improve query performance. (Learn)

You are given a Singly Linked List of integers. Return true if it has a cycle, else return false.

A cycle occurs when a node's next points back to a previous node in the list.

Example:

In the given linked list, there is a cycle, hence we return true.