Longest Substring Without Repeating Characters
Implement a function that returns the length of the longest substring without repeating characters.
Reduce array to zero
Given an array of non-negative integers, each operation chooses two indices and subtracts 1 from each if both are positive. Return the minimum number of operations to reduce the array to all zeros, or -1 if impossible.
Two Sum Sorted
Given a 1-indexed sorted array and a target, return the two indices that add up to the target.
Squares of Sorted Array
Implement a function that returns a sorted list of squares for a given non-decreasing integer array.
Container With Most Water
Compute the maximum area between two vertical lines in an array of heights.
Showing 5 challenges · easy · Two Pointers & Sliding Window
Two Pointers & Sliding Window — Python coding challenges
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This page lists two pointers & sliding window challenges — real Python problems you solve in the browser IDE with instant test feedback. Each challenge includes a clear brief, starter code, and automated checks.
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