beehard

摘要： Given a string containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid.The brackets must close in the correct order, "()" and "()[]{}" are all valid but "(]" and "([)]&qu 阅读全文

摘要： 2SumGiven an array of integers, find two numbers such that they add up to a specific target number. The function twoSum should return indices of the t... 阅读全文