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Validate if a given string is numeric. Some examples:"0" => true" 0.1 " => true"abc" => false"1 a" => false"2e10" => true Note: It is intended for the 阅读全文
posted @ 2016-08-05 23:11
北叶青藤
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The string "PAYPALISHIRING" is written in a zigzag pattern on a given number of rows like this: (you may want to display this pattern in a fixed font 阅读全文
posted @ 2016-08-05 11:49
北叶青藤
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H-Index I Given an array of citations (each citation is a non-negative integer) of a researcher, write a function to compute the researcher's h-index. 阅读全文
posted @ 2016-08-05 11:06
北叶青藤
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Given a string S, you are allowed to convert it to a palindrome by adding characters in front of it. Find and return the shortest palindrome you can f 阅读全文
posted @ 2016-08-05 08:11
北叶青藤
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Implement an iterator to flatten a 2d vector. For example, Given 2d vector = By calling next repeatedly until hasNext returns false, the order of elem 阅读全文
posted @ 2016-08-05 04:04
北叶青藤
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Factor Combinations Problem: Numbers can be regarded as product of its factors. For example, 8 = 2 x 2 x 2; = 2 x 4. Write a function that takes an in 阅读全文
posted @ 2016-08-05 03:25
北叶青藤
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Verify Preorder Sequence in Binary Search Tree \Given an array of numbers, verify whether it is the correct preorder traversal sequence of a binary se 阅读全文
posted @ 2016-08-05 01:27
北叶青藤
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A group of two or more people wants to meet and minimize the total travel distance. You are given a 2D grid of values 0 or 1, where each 1 marks the h 阅读全文
posted @ 2016-08-05 00:34
北叶青藤
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