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https://leetcode.com/problems/longest-common-prefix/description/ Write a function to find the longest common prefix string amongst an array of strings 阅读全文
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https://leetcode.com/problems/roman-to-integer/description/ Roman numerals are represented by seven different symbols: I, V, X, L, C, D and M. For exa 阅读全文
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https://leetcode.com/problems/palindrome-number/description/ Determine whether an integer is a palindrome. An integer is a palindrome when it reads th 阅读全文
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https://leetcode.com/problems/reverse-integer/description/ Given a 32-bit signed integer, reverse digits of an integer. Example 1: Example 2: Example 阅读全文
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http://poj.org/problem?id=3660 N (1 ≤ N ≤ 100) cows, conveniently numbered 1..N, are participating in a programming contest. As we all know, some cows 阅读全文