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https://leetcode.com/problems/evaluate-reverse-polish-notation/ Evaluate the value of an arithmetic expression in Reverse Polish Notation. Valid opera 阅读全文
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https://leetcode.com/problems/single-number-ii/ Given a non-empty array of integers, every element appears three times except for one, which appears e 阅读全文
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https://leetcode.com/problems/largest-number/ Given a list of non negative integers, arrange them such that they form the largest number. Example 1: E 阅读全文
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https://leetcode.com/problems/factorial-trailing-zeroes/ Given an integer n, return the number of trailing zeroes in n!. Example 1: Example 2: Note: Y 阅读全文
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https://leetcode.com/problems/excel-sheet-column-number/ Given a column title as appear in an Excel sheet, return its corresponding column number. For 阅读全文
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https://leetcode.com/problems/excel-sheet-column-title/ Given a positive integer, return its corresponding column title as appear in an Excel sheet. F 阅读全文
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https://leetcode.com/problems/maximum-gap/ Given an unsorted array, find the maximum difference between the successive elements in its sorted form. Re 阅读全文
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https://leetcode.com/problems/min-stack/ Design a stack that supports push, pop, top, and retrieving the minimum element in constant time. push(x) -- 阅读全文
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https://leetcode.com/problems/compare-version-numbers/ Compare two version numbers version1 and version2.If version1 > version2 return 1; if version1 阅读全文