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Path Sum III
Path Sum IIIYou are given a binary tree in which each node contains an integer value. Find the number of paths that sum to a given value. The path does not need to start or end at the root or a leaf,
記錄: 2017/3
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Number of Segments in a String
Number of Segments in a StringCount the number of segments in a string, where a segment is defined to be a contiguous sequence of non-space characters. Please note that the string does not contain an
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Add Strings
Add StringsGiven two non-negative integers num1 and num2 represented as string, return the sum of num1 and num2. Note: The length of both num1 and num2 is < 5100. Both num1 and num2 contains only
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Third Maximum Number
Third Maximum NumberGiven a non-empty array of integers, return the third maximum number in this array. If it does not exist, return the maximum number. The time complexity must be in O(n). Example 1
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Longest Palindrome
Longest PalindromeGiven a string which consists of lowercase or uppercase letters, find the length of the longest palindromes that can be built with those letters. This is case sensitive, for example
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Convert a Number to Hexadecimal
Convert a Number to HexadecimalGiven an integer, write an algorithm to convert it to hexadecimal. For negative integer, two’s complement method is used. Note: All letters in hexadecimal (a-f) must b
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Sum of Left Leaves
Sum of Left LeavesFind the sum of all left leaves in a given binary tree. For Example:1234567 3 / \ 9 20 / \ 15 7There are two left leaves in the binary tree, with values 9 and 15 resp
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Binary Watch
Binary WatchA binary watch has 4 LEDs on the top which represent the hours (0-11), and the 6 LEDs on the bottom represent the minutes (0-59). Each LED represents a zero or one, with the least signifi