Given an unsorted integer array, find the first missing positive integer. For example, Given [1,2,0] return 3, and [3,4,-1,1] return 2. Your algorithm should run in O(n) time and uses constant space. » View Solution (link to this question)

Given an array containing n distinct numbers taken from 0, 1, 2, …, n, find the one that is missing from the array. For example, Given nums = [0, 1, 3] return 2.

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Use two pointers the fast and the slow. The fast one goes forward two steps each time, while the slow one goes only step each time. They must meet the same item when slow==fast. In fact, they meet in a circle, the duplicate number must be the entry point of the circle when visiting the array from nums[0]. Next we just need to find the entry point.

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This link was posted on Dec 30, 2018 in blind Curated List of Top 100 LeetCode Questions. I found it so useful and would like to cover these problem in the following post as well. Array Two Sum - htDuplicate content is content that appears on the internet in more than one place. That "one place" is defined as a location with a unique website address (URL) - so, if the same content appears at more than one web address, you've got duplicate content.

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leetcode 力扣刷题 1 到 300 的感受 ... 41. First Missing Positive ... 287*. Find the Duplicate Number

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leetcode 力扣刷题 1 到 300 的感受 ... 41. First Missing Positive ... 287*. Find the Duplicate Number