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[题目] Merge two sorted linked lists and return it as a new list. The new list should be made by splicing together the nodes of the first two lists. [题目 阅读全文
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[题目] Given a string containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid. The brackets must close in 阅读全文
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[题目] Determine whether an integer is a palindrome. Do this without extra space. [题目解析] 判断一个给定整数是否为回文数，回文数即121，11411这种正着和反着相同的数字，最小的回文数是0。实现思路可以比较直接，先对 阅读全文