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git rm -r --cached .//清空缓存 git add .//重新提交 git commit -m "update .gitignore" git push 模板: *.iml.idea/*.ipr*.iws*.class.out/ 阅读全文
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Given n non-negative integers representing an elevation map where the width of each bar is 1, compute how much water it is able to trap after raining. 阅读全文
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Question 1: How to find middle element of linked list in one pass? Question 1: How to find middle element of linked list in one pass? One of the most 阅读全文
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What are Divide and Conquer algorithms? Describe how they work. Can you give any common examples of the types of problems where this approach might be 阅读全文
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Given an array of size n, find the majority element. The majority element is the element that appears more than ⌊ n/2 ⌋ times. You may assume that the 阅读全文