Note that the digits'0'and'1'do not map to any letters, so Alicedoes notuse them. However, due to an error in transmission, Bob did not receive Alice's text message but received astring of pressed keysinstead.
2376. 统计特殊整数 - 如果一个正整数每一个数位都是 互不相同 的,我们称它是 特殊整数 。 给你一个 正 整数 n ,请你返回区间 [1, n] 之间特殊整数的数目。 示例 1: 输入:n = 20 输出:19 解释:1 到 20 之间所有整数除了 11 以外都是特殊整数。所以总共有 19 个
[LeetCode] 2364. Count Number of Bad Pairs You are given a 0-indexed integer array nums. A pair of indices (i, j) is a bad pair if i < j and j - i != nums[j] - nums[i]. Return the total number of bad pairs in nums. Example 1: Input: nums = [4,1,3,3] Output: 5...
Can you solve this real interview question? Count Numbers with Unique Digits - Given an integer n, return the count of all numbers with unique digits, x, where 0 <= x < 10n. Example 1: Input: n = 2 Output: 91 Explanation: The answer should be the t
leetcode 357. Count Numbers with Unique Digits 统计独特编码数组的数量 + 一个很简单的排列组合问题 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 ...
publicclassSolution {publicintcountNumbersWithUniqueDigits(intn) {if(0 ==n)return1;if(1 ==n)return10;intsum = 10;for(inti=2; i<=n; i++) sum+=getMul(i);returnsum; }//计算f(k)publicintgetMul(intn){intresult = 1;for(inti=9-n+2; i<=9; i++) ...
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) { ...
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,return91. (The answer should be the total numbers in the range of 0 ≤ x < 100, excluding [11,22,33,44,55,66,77,88,99...
leetcode palindrome-number题解 题目描述:Determine whether an integer is a palindrome. An integer is a palindrome when it reads the same backward as forward. 汉语理解:判断一个数字是不是回文数字,其中题目给的提示中说明负数不是回文数字。 解题思路:(1)负数不是回文数 &n...leetCode palindrome-...