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Find the contiguous subarray within an array (containing at least one number) which has the largest sum. For example, given the array [-2,1,-3,4,-1,2, 阅读全文
posted @ 2016-09-13 15:16
Machelsky
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Given a binary tree and a sum, determine if the tree has a root-to-leaf path such that adding up all the values along the path equals the given sum. F 阅读全文
posted @ 2016-09-13 13:41
Machelsky
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A message containing letters from A-Z is being encoded to numbers using the following mapping: Given an encoded message containing digits, determine t 阅读全文
posted @ 2016-09-13 13:06
Machelsky
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Calculate the sum of two integers a and b, but you are not allowed to use the operator + and -. Example:Given a = 1 and b = 2, return 3. 思路：xor相加存无car 阅读全文
posted @ 2016-09-13 11:24
Machelsky
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Given two strings s and t, write a function to determine if t is an anagram of s. For example,s = "anagram", t = "nagaram", return true.s = "rat", t = 阅读全文
posted @ 2016-09-13 10:43
Machelsky
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Given a singly linked list, determine if it is a palindrome. 思路：stack存数，然后从头比较。 Solution2: Follow up: O(n) in time, O(1) in space. 思路：用reverse linkedl 阅读全文
posted @ 2016-09-13 08:54
Machelsky
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Given a positive integer, return its corresponding column title as appear in an Excel sheet. For example: Solution2: 把数字减一再运算就不用考虑其他问题了。参考了discussion 阅读全文
posted @ 2016-09-13 07:08
Machelsky
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