Real Interview Questions

Write code to check if a list is a palindrome.

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Palindrome Algorithms Python

🟢 Easy Coding Junior Asked 3× Apr 2026

Write a Python program to return an array of the starting indices of all concatenated substrings in the given string. Input: string = '123456876456123987', words = ['123','456']. Output: [0,9]. Explanation: The substring starting at 0 is '123456'. It is the concatenation of ['123','456'] which is a permutation of words. The substring starting at 9 is '456123'. It is the concatenation of ['456','123'] which is a permutation of words.

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String Substring Algorithm

🟡 Medium Coding Junior Asked 1× May 2026

There are 100 people standing in a single straight line, all facing forward. They cannot look back or around. They are wearing colored hats of different colors. What is the maximum number of people who can correctly guess their hat color?

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Logic Puzzles Algorithms Problem Solving

🟡 Medium Conceptual Mid Asked 1× May 2026

Why is it important to consider time and space complexity?

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Time Complexity Space Complexity Algorithms

🟢 Easy Conceptual Fresher Asked 1× Apr 2026

Will time complexity matter when finding a solution in a thousand lines of code? How can I determine the time complexity?

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Time Complexity Algorithm Analysis Python

🟡 Medium Conceptual Junior Asked 1× Apr 2026

What is time complexity?

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Time Complexity Algorithms

🟢 Easy Conceptual Fresher Asked 1× Apr 2026

What is the time complexity of the code written?

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Time Complexity Algorithms

🟡 Medium Conceptual Junior Asked 1× Apr 2026

Find the index of the first repeating character in a string.

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String Algorithms Hashmap

🟡 Medium Coding Junior Asked 1× Apr 2026

Find the index of the first non-repeating character in a string.

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String Algorithms Hashmap

🟡 Medium Coding Junior Asked 1× Apr 2026

Write a function that returns the index of the first non-repeating character in a given string.

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String Algorithms Php

🟡 Medium Coding Junior Asked 1× Apr 2026

Give the common elements from both datasets.

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Arrays Set Algorithms

🟡 Medium Coding Junior Asked 1× Apr 2026

Given the list list1 = [1, 2, 2, 3, 1, 4, 2, 3], find the frequency of each element without using existing functions.

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Python Data Structures Algorithms

🟢 Easy Coding Junior Asked 1× Mar 2026