Data Structure Interview Questions on Arrays and Strings

Arrays and strings are among the most common topics in data structure interview questions, especially for entry-level coding rounds and screening tests. Their simplicity, combined with versatile applications, makes them a favorite among interviewers. Common questions include: “Find the missing number in an array of 1 to n,” “Remove duplicates from a sorted array,” or “Check if a string is a palindrome.” These problems test your understanding of indexing, iteration, and memory usage. You may also be asked to perform operations like rotating an array, merging two sorted arrays, or reversing words in a string. Advanced variations involve using sliding window techniques to solve problems like “Longest substring without repeating characters” or “Maximum sum subarray.” Interviewers often expect optimized solutions. For example, a brute-force approach may work, but they’ll be more impressed by your ability to reduce time complexity using hash maps or two-pointer techniques. Understanding edge cases, such as empty arrays or boundary index conditions, is also critical. Being able to trace your logic step-by-step shows problem-solving maturity. Mastering data structure interview questions on arrays and strings builds a strong base for more complex topics like dynamic programming and tree traversal.

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