随笔分类 - Numbers & Digits
摘要：Given an array with n integers, your task is to check if it could become non-decreasing by modifying at most 1 element. We define an array is non-decr
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摘要：Given an integer n, return 1 - n in lexicographical order. For example, given 13, return: [1,10,11,12,13,2,3,4,5,6,7,8,9]. Please optimize your algori
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摘要：The Hamming distance between two integers is the number of positions at which the corresponding bits are different. Now your job is to find the total
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摘要：The Hamming distance between two integers is the number of positions at which the corresponding bits are different. Given two integers x and y, calcul
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摘要：Given an array of integers, 1 ≤ a[i] ≤ n (n = size of array), some elements appear twice and others appear once. Find all the elements that appear twi
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摘要：Given an integer, write a function to determine if it is a power of three. Follow up:Could you do it without using any loop / recursion?
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摘要：Determine whether an integer is a palindrome. Do this without extra space. 分析：把一个数倒过来，然后看两个数是否相同。 Reverse digits of an integer. Example1: x = 123, ret
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摘要：Given a sorted positive integer array nums and an integer n, add/patch elements to the array such that any number in range [1, n]inclusive can be form
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摘要：Given an array nums containing n + 1 integers where each integer is between 1 and n (inclusive), prove that at least one duplicate number must exist.
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摘要：Strobogrammatic Number I A strobogrammatic number is a number that looks the same when rotated 180 degrees (looked at upside down). Write a function t
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摘要：Construct minimum number by reordering a given non-negative integer array. Arrange them such that they form the minimum number. Notice The result may
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摘要：Given two integers representing the numerator and denominator of a fraction, return the fraction in string format. If the fractional part is repeating
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摘要：Given an integer n, count the total number of digit 1 appearing in all non-negative integers less than or equal to n. For example:Given n = 13,Return
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摘要：Suppose you are at a party with n people (labeled from 0 to n - 1) and among them, there may exist one celebrity. The definition of a celebrity is tha
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摘要：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
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摘要：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
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摘要：Additive number is a string whose digits can form additive sequence. A valid additive sequence should contain at least three numbers. Except for the f
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摘要：Missing Ranges You are given an inclusive range [lower, upper] and a sorted unique integer array nums, where all elements are in the inclusive range.
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摘要：Given a range [m, n] where 0 <= m <= n <= 2147483647, return the bitwise AND of all numbers in this range, inclusive. For example, given the range [5,
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摘要：There are n bulbs that are initially off. You first turn on all the bulbs. Then, you turn off every second bulb. On the third round, you toggle every
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