摘要：
Given an integer array with all positive numbers and no duplicates, find the number of possible combinations that add up to a positive integer target. 阅读全文
posted @ 2020-03-22 18:44
米开朗菠萝
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摘要：
A sequence of numbers is called a wiggle sequence if the differences between successive numbers strictly alternate between positive and negative. The 阅读全文
posted @ 2020-03-22 17:53
米开朗菠萝
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摘要：
Given a non-negative integer n, count all numbers with unique digits, x, where 0 ≤ x < 10n. Example: Input: 2 Output: 91 Explanation: The answer shoul 阅读全文
posted @ 2020-03-22 11:16
米开朗菠萝
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