[LeetCode] Strobogrammatic Number III
The idea is similar to Strobogrammatic Number II: generate all those in-range strobogrammatic numbers and count. You may refer to this link for a very readable code, which I have rewritten in C++ bel....
[LeetCode] Single Number III
Try to split all the numbers into two groups with each of the target one in different groups. Refer to this link for a nice explanation. The code is written as follows. 1 class Solution { 2 public...
[LeetCode] Happy Number
Well, no matter whether the number is happy or not, its sum-of-squared-digits sequance has a cycle. Well, do you still remember the algorithm for detecting cycles in linked lists? Yeah, use a fast an....
[LeetCode] Palindrome Number
The most obvious idea is to maintain two divisors to get the most and least significant digits and compare them. Well, there are much more clever ideas, like this one, whose code is rewritten bel...
[LeetCode] Strobogrammatic Number II
This problem can be solved easily once you find the regularities :-) This link has done it for you. You may refer to its Python version. I rewrite it in C++ below. 1 class Solution { 2 public: 3 ...
[LeetCode] Strobogrammatic Number
Problem Description: A strobogrammatic number is a number that looks the same when rotated 180 degrees (looked at upside down). Write a function to determine if a number is strobogrammatic. The numbe....
[LeetCode]233.Number of Digit One
题目 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 6, because digit 1 occurred in the follo...
[LeetCode] Valid Number
I guess some of you may have noticed that this seemingly simple problem has the lowest acceptance rate among all problems on the LeetCode OJ. Well, some of you may also complain about the annoying la....
[LeetCode] Number of Digit One
The following idea is taken from a book named 《剑指offer》 published in China. Suppose n = 271, it then breaks [1, 271] into [1, 71] and [72, 271]. For [72, 271], the n...
leetcode 9 Palindrome Number 回文数
Determine whether an integer is a palindrome. Do this without extra space. click to show spoilers. Some hints: Could negative integers be palindromes? (ie, -1) If you are thinking of converting ...
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