Given a positive integer N, return the number of positive integers less than or equal to N that have at least 1 repeated digit. Example 1: Input: 20 Output: 1 Explanation: The only positive number (<= 20) with at least 1 repeated digit is 11. Example…
题目如下: Given a positive integer N, return the number of positive integers less than or equal to N that have at least 1 repeated digit. Example 1: Input: 20 Output: 1 Explanation: The only positive number (<= 20) with at least 1 repeated digit is 11. E…
2020-01-03 12:01:46 问题描述: 问题求解: 确实可以当作数学题去做,但是要分类讨论什么的还是有点麻烦的. 这个时候万能的dfs上场了,直接暴力检索,真的太强了. int res = 0; public int numDupDigitsAtMostN(int N) { dfs(0, 0, N); return N - res + 1; } private void dfs(long curr, int used, int N) { if (curr > N) return; r…
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]) Hint: A direct…
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]) public class Sol…
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]) Analysis: A num…
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]) 代码如下: public cla…
题目描述: Given a non-negative integer n, count all numbers with unique digits, x, where 0 ≤ x < 10n. 解题分析: 题目要就就是找出 0≤ x < 10n中各位数字都不相同的数的个数.要接触这道题只需要理解: 1.设f(n)表示n为数字中各位都不相同的个数,则有countNumbersWithUniqueDigits(n)=f(1)+f(2)+……+f(n)=f(n)+countNumbersWithU…
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]) 思路: 思路: 排列组合题. 设…
Given a non-negative integer n, count all numbers with unique digits, x, where 0 ≤ x < 10n. Example: Input: 2 Output: 91 Explanation: The answer should be the total numbers in the range of 0 ≤ x < 100, excluding 11,22,33,44,55,66,77,88,99 给定一个非负整数…
题目描述: 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]) 解题思路: This…
Given a non-negative integer n, count all numbers with unique digits, x, where 0 ≤ x < 10^n. 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]) 思路:DP dp[i]表示10…
Given a non-negative integer n, count all numbers with unique digits, x, where 0 ≤ x < 10n. Example: Input: 2 Output: 91 Explanation: The answer should be the total numbers in the range of 0 ≤ x < 100, excluding 11,22,33,44,55,66,77,88,99 Runtime:…
作者: 负雪明烛 id: fuxuemingzhu 个人博客: http://fuxuemingzhu.cn/ 目录 题目描述 题目大意 解题方法 日期 题目地址:https://leetcode.com/problems/count-numbers-with-unique-digits/description/ 题目描述 Given a non-negative integer n, count all numbers with unique digits, x, where 0 ≤ x <…
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.示例:给定 n = 2,返回 91.(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++: class Solution { public: int countNumbersWith…
1012. Complement of Base 10 Integer Every non-negative integer N has a binary representation. For example, 5 can be represented as "101" in binary, 11 as "1011" in binary, and so on. Note that except for N = 0, there are no leading z…
# Title Solution Acceptance Difficulty Frequency 4 Median of Two Sorted Arrays 27.2% Hard 10 Regular Expression Matching 25.6% Hard 23 Merge k Sorted Lists 35.8% Hard 25 Reverse Nodes in k-Group 37.7% Hard …
Repeatless Numbers Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 1719 Accepted: 726 Description A repeatless number is a positive integer containing no repeated digits. For instance, the first 25 repeatless numbers are 1, 2, 3, 4, 5,…
http://codeforces.com/contest/747/problem/F cf #387 div2 problem f 非常好的一道题.看完题,然后就不知道怎么做,感觉是dp,但是不知道怎么枚举.还有就是一般求第k小的思路一般是什么?对这类题目理解的不是很好. 这道题,跟上一篇的题解里面写的hdu 1002 递增数的题目的解法差不多,但是底层的求解需要花一些时间去推敲! 不会做,就看官方题解,看不懂说的什么.就从下面的讨论找大神的题解. I can describe my solu…
Microsoft Interview Question Developer Program Engineers 看到一个题目比较有意思: Print the numbers between 30 to 3000. CONSTRAINT: The numbers shouldnt contain digits either in incresing order or decreasing order. FOLLOWING NOT ALLOWED ##123,234,345,1234,2345##…
1013. K-based Numbers. Version 3 Let’s consider K-based numbers, containing exactly N digits. We define a number to be valid if its K-based notation doesn’t contain two successive zeros. For example: 1010230 is a valid 7-digit number; 1000198 is not…
We have a sorted set of digits D, a non-empty subset of {'1','2','3','4','5','6','7','8','9'}. (Note that '0' is not included.) Now, we write numbers using these digits, using each digit as many times as we want. For example, if D = {'1','3','5'},…
We have a sorted set of digits D, a non-empty subset of {'1','2','3','4','5','6','7','8','9'}. (Note that '0' is not included.) Now, we write numbers using these digits, using each digit as many times as we want. For example, if D = {'1','3','5'},…
今天看Thinking in Java看到一个吸血鬼数的问题,于是查找UVa里也有类似的问题就动手写了先是用Java写的,不过WA了两次,然后没有发现错误,又用c++写的还是不行.最后发现要排序去重.然后改用Java的SortedSet解决了这个问题,主要就是暴力枚举求解.但是同样的算法Java用了将近5秒.c++只用了1秒.差距啊.还有避免不必要的重复的循环不能为00,还有不能为奇数.尽量提高程序的效率. 题目描述: Problem D Vampire Numbers Input: stand…
题目: We have a sorted set of digits D, a non-empty subset of {'1','2','3','4','5','6','7','8','9'}. (Note that '0' is not included.) Now, we write numbers using these digits, using each digit as many times as we want. For example, if D = {'1','3','5…
I. Move Between Numbers time limit per test 2.0 s memory limit per test 256 MB input standard input output standard output You are given n magical numbers a1, a2, ..., an, such that the length of each of these numbers is 20 digits. You can move from…
We have a sorted set of digits D, a non-empty subset of {'1','2','3','4','5','6','7','8','9'}. (Note that '0' is not included.) Now, we write numbers using these digits, using each digit as many times as we want. For example, if D = {'1','3','5'},…
