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题目： Given two strings s and t, determine if they are isomorphic. Two strings are isomorphic if the characters in s can be replaced to get t. All occur 阅读全文
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题目： Description: Count the number of prime numbers less than a non-negative number, n. Credits:Special thanks to @mithmatt for adding this problem and 阅读全文
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题目： Remove all elements from a linked list of integers that have value val. ExampleGiven: 1 --> 2 --> 6 --> 3 --> 4 --> 5 --> 6, val = 6Return: 1 --> 阅读全文
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题目： Write an algorithm to determine if a number is "happy". A happy number is a number defined by the following process: Starting with any positive in 阅读全文
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题目： You are a professional robber planning to rob houses along a street. Each house has a certain amount of money stashed, the only constraint stoppin 阅读全文
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题目： Write a function that takes an unsigned integer and returns the number of ’1' bits it has (also known as the Hamming weight). For example, the 32- 阅读全文
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题目： Reverse bits of a given 32 bits unsigned integer. For example, given input 43261596 (represented in binary as 00000010100101000001111010011100), r 阅读全文
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题目： Rotate an array of n elements to the right by k steps. For example, with n = 7 and k = 3, the array [1,2,3,4,5,6,7] is rotated to [5,6,7,1,2,3,4]. 阅读全文
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题目： Given an integer n, return the number of trailing zeroes in n!. Note: Your solution should be in logarithmic time complexity. 链接： http://leetcode. 阅读全文
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题目： Related to question Excel Sheet Column Title Given a column title as appear in an Excel sheet, return its corresponding column number. For example 阅读全文