摘要：
Valid Parentheses题目：Given a string containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid.The brackets... 阅读全文
摘要：
Remove Nth Node From End of List题目：Given a linked list, remove the nth node from the end of list and return its head.For example, Given linked list:... 阅读全文