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![Missing Number - LeetCode 268 - Python [O(n) time and O(1) space]](/_next/image?url=https%3A%2F%2Fi.ytimg.com%2Fvi%2FbHywnWhkrpc%2Fhq720.jpg%3Fsqp%3D-oaymwEXCNAFEJQDSFryq4qpAwkIARUAAIhCGAE%3D%26rs%3DAOn4CLCrbJmFIjCbRX6j8XfwWm8x8xMcwg&w=256&q=75)