Given a non-negative integer n, count all numbers with unique digits, x, where 0 ≤ x < 10n. Example: Given n = 2, return 91. (The answer should be the total numbers in the range of 0 ≤ x < 100, excluding [11,22,33,44,55,66,77,88,99]) 这道题主要是考察所有的digit的唯一...
Given anon-negativeinteger n, count all numbers with unique digits, x, where 0 ≤ x < 10n. Example: Given n = 2, return 91. (The answer should be the total numbers in the range of 0 ≤ x < 100, excluding[11,22,33,44,55,66,77,88,99]) Hint: A direct way is to use the ...
leetcode| Count Numbers with Unique Digits Given a non-negative integer n, count all numbers with unique digits, x, where 0 ≤ x < 10n. Example: Given n = 2, return 91. (The answer should be the total numbers in the range of 0 ≤ x < 100, excluding[11,22,33,44,55,66,77,88...
(答案应该是除[11,22,33,44,55,66,77,88,99]外,0 ≤ x < 100 间的所有数字) 详见:https://leetcode.com/problems/count-numbers-with-unique-digits/description/ C++: classSolution{public:intcountNumbersWithUniqueDigits(intn){if(n==0){return1;}intres=0;for(inti=1;i<=n;++i){res+=count...
LeetCode 357. Count Numbers with Unique Digits 简介:给定一个非负整数 n,计算各位数字都不同的数字 x 的个数,其中 0 ≤ x < 10n 。 Description Given a non-negative integer n, count all numbers with unique digits, x, where 0 ≤ x < 10n....
classSolution {public:intcountNumbersWithUniqueDigits(intn) {if(n ==0)return1;intres =0;for(inti =1; i <= n; ++i) {res+=count(i); }returnres; }intcount(intk) {if(k <1)return0;if(k ==1)return10;intres =1;for(inti =9; i >= (11- k); --i) { ...
https://leetcode.com/problems/count-numbers-with-unique-digits/ dfs解法: classSolution{intres;voiddfs(vector<bool>&used,intleft){if(left==0){return;}for(inti=0;i<=9;i++){if(used[i])continue;used[i]=true;if(!i==0)res++;dfs(used,left-1);used[i]=false;}}public:intcountNumbers...
357. Count Numbers with Unique Digits classSolution(object):defcountNumbersWithUniqueDigits(self,n):""" :type n: int :rtype: int """res=0ifn==0:return1whilen>0:res+=self.helper(n)n-=1returnresdefhelper(self,n):ifn==1:return10res=9*9n-=2temp=8whilen>0:n-=1res*=temp ...
A set of practice note, solution, complexity analysis and test bench to leetcode problem set - leetcode/CountSubArrayFixBound.drawio at b58bcceb0ea27d0756ad72fb6a64b3b547fae221 · brianchiang-tw/leetcode
My Solutions to Leetcode problems. All solutions support C++ language, some support Java and Python. Multiple solutions will be given by most problems. Enjoy:) 我的Leetcode解答。所有的问题都支持C++语言,一部分问题支持Java语言。近乎所有问题都会提供多个算