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…

https://leetcode.com/problems/numbers-with-repeated-digits/ 与leetcode_357. Count Numbers with Unique Digits有一些相似的地方. 给定N,计算小于等于N且至少有一个重复数位的数的数目. 可转化为计算小于等于N且所有数位不相同的数的数目.且可分为两部分, 位数与N相同且小于等于N且所有数位不相同的数的数目: 位数小于N且所有数位不相同的数的数目. 难点在于第1部分. 解法一: 使用dfs计算第一…

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…

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 <…

[LeetCode]129. Sum Root to Leaf Numbers 解题报告(Python) 标签(空格分隔): LeetCode 题目地址:https://leetcode.com/problems/sum-root-to-leaf-numbers/description/ 题目描述: Given a binary tree containing digits from 0-9 only, each root-to-leaf path could represent a numbe…

[LeetCode]165. Compare Version Numbers 解题报告(Python) 标签(空格分隔): LeetCode 作者: 负雪明烛 id: fuxuemingzhu 个人博客: http://fuxuemingzhu.me/ 题目地址:https://leetcode.com/problems/compare-version-numbers/description/ 题目描述: Compare two version numbers version1 and vers…

[九度OJ]题目1012:畅通工程 解题报告 标签(空格分隔): 九度OJ 原题地址:http://ac.jobdu.com/problem.php?pid=1012 题目描述: 某省调查城镇交通状况,得到现有城镇道路统计表,表中列出了每条道路直接连通的城镇.省政府"畅通工程"的目标是使全省任何两个城镇间都可以实现交通(但不一定有直接的道路相连,只要互相间接通过道路可达即可).问最少还需要建设多少条道路? 输入: 测试输入包含若干测试用例.每个测试用例的第1行给出两个正整数,分别是城镇…

[九度OJ]题目1442:A sequence of numbers 解题报告 标签(空格分隔): 九度OJ 原题地址:http://ac.jobdu.com/problem.php?pid=1442 题目描述: Xinlv wrote some sequences on the paper a long time ago, they might be arithmetic or geometric sequences. The numbers are not very clear now, a…

[LeetCode]738. Monotone Increasing Digits 解题报告(Python) 标签(空格分隔): LeetCode 作者: 负雪明烛 id: fuxuemingzhu 个人博客: http://fuxuemingzhu.cn/ 题目地址:https://leetcode.com/problems/monotone-increasing-digits/description/ 题目描述: Given a non-negative integer N, find th…