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Does your playlist have the same song twice? That's LeetCode 217, Contains Duplicate, and it has a one-pass answer. Here's how 👇 𝗧𝗵𝗲 𝗽𝗿𝗼𝗯𝗹𝗲𝗺: Your function gets a list of numbers and returns True if any number appears at least twice, False if they are all different. In the video: 1, 2, 3, 1 returns True, because 1 sits at positions 0 and 3. The obvious way compares every pair. When nothing repeats, every pair gets checked: LeetCode allows up to 100,000 numbers, which is 4,999,950,000
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