Algorithms Interview Questions

25 real Algorithms questions asked in live technical interviews — each with a model answer. Updated weekly.

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Given a string s, write a Python function to find the length of the longest substring without repeating characters.🟡 Medium · Coding · Asked 10×What logic are you applying?🟢 Easy · Conceptual · Asked 7×What is a Python palindrome?🟢 Easy · Conceptual · Asked 6×Write code to check if a list is a palindrome.🟢 Easy · Coding · Asked 3×Find the most occurring element and its frequency in an array.🟡 Medium · Coding · Asked 1×Given a list of customer purchase dates, identify customers who have not made a purchase on three consecutive dates.🟡 Medium · Coding · Asked 1×Which algorithm counts the occurrences of the characters 's', 'B', and 'C' in a given string?🟡 Medium · Coding · Asked 1×Provide a straightforward solution that does not use string functions.🟡 Medium · Coding · Asked 1×What sorting technique would you use to sort data?🟢 Easy · Conceptual · Asked 1×We have 10 teams. Each team will play against every other team, alternating home and away stadiums. How would you design a schedule for these matches?🟡 Medium · Conceptual · Asked 1×Return true if two strings match with only one swap.🟡 Medium · Coding · Asked 1×Given two strings, determine if they match exactly or can be made equal by swapping exactly one pair of characters in one of the strings. Return true if they match, false otherwise.🟡 Medium · Coding · Asked 1×Write a function that reads two input strings and returns true if they match exactly or if they can be made equal by swapping exactly one pair of characters in one of the strings; otherwise return false.🟡 Medium · Coding · Asked 1×Count how many times each word appears and show the result in a dictionary.🟡 Medium · Coding · Asked 1×Write code to find the longest common substring among the input list ['flower', 'floor', 'flow'].🟡 Medium · Coding · Asked 1×Find the longest common prefix among the strings ['flow', 'flower', 'floor'].🟢 Easy · Coding · Asked 1×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?🟡 Medium · Conceptual · Asked 1×Why is it important to consider time and space complexity?🟢 Easy · Conceptual · Asked 1×What is time complexity?🟢 Easy · Conceptual · Asked 1×What is the time complexity of the code written?🟡 Medium · Conceptual · Asked 1×Find the index of the first repeating character in a string.🟡 Medium · Coding · Asked 1×Find the index of the first non-repeating character in a string.🟡 Medium · Coding · Asked 1×Write a function that returns the index of the first non-repeating character in a given string.🟡 Medium · Coding · Asked 1×Give the common elements from both datasets.🟡 Medium · Coding · Asked 1×Given the list list1 = [1, 2, 2, 3, 1, 4, 2, 3], find the frequency of each element without using existing functions.🟢 Easy · Coding · Asked 1×

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