next-unique-digit-number

本文介绍了一种生成非负整数序列的方法,序列中每个数字的十进制位都必须是唯一的。序列的范围限制在[0, 9876543210]内。提供了一个函数,用于在给定符合该条件的数字后,找到其下一个最大的数字,即序列中下一个比给定数字大的数字,且保持数字序列的独特性。

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转自:http://www.fgdsb.com/2015/01/03/next-unique-digit-number/


有一种integer序列满足以下条件

  1. 非负
  2. 不能有重复的digit,比如11是不合法的
  3. 递增,既后面产生的比前面产生的要大,比如10的下一个数字是12
    显然,这组数字的范围为[0, 9876543210]

输入一个一定符合该条件的数字,返回下一个(比输入大但是最小的)数。
如果不存在这样的下一个数,则返回0
For example:
Given 789
Next integer should be 790
Given 98
Next integer should be 102
Given 9876543210
Just return 0

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uint64_t get_next_number(uint64_t n) {
if(n >= 9876543210) return 0;
auto check_valid = [](uint64_t num) {
bool used[10] = {false};
while(num) {
if(used[num % 10]) return false;
used[num % 10] = true;
num /= 10;
}
return true;
};
while(!check_valid(++n));
return n;
}

(c++题解,代码运行时间小于200ms,内存小于64MB,代码不能有注释)It’s time for the company’s annual gala! To reward employees for their hard work over the past year, PAT Company has decided to hold a lucky draw. Each employee receives one or more tickets, each of which has a unique integer printed on it. During the lucky draw, the host will perform one of the following actions: Announce a lucky number x, and the winner is then the smallest number that is greater than or equal to x. Ask a specific employee for all his/her tickets that have already won. Declare that the ticket with a specific number x wins. A ticket can win multiple times. Your job is to help the host determine the outcome of each action. Input Specification: The first line contains a positive integer N (1≤N≤10 5 ), representing the number of tickets. The next N lines each contains two parts separated by a space: an employee ID in the format PAT followed by a six-digit number (e.g., PAT202412) and an integer x (−10 9 ≤x≤10 9 ), representing the number on the ticket. Then the following line contains a positive integer Q (1≤Q≤10 5 ), representing the number of actions. The next Q lines each contain one of the following three actions: 1 x: Declare the ticket with the smallest number that is greater than or equal to x as the winner. 2 y: Ask the employee with ID y all his/her tickets that have already won. 3 x: Declare the ticket with number x as the winner. It is guaranteed that there are no more than 100 actions of the 2nd type (2 y). Output Specification: For actions of type 1 and 3, output the employee ID holding the winning ticket. If no valid ticket exists, output ERROR. For actions of type 2, if the employee ID y does not exist, output ERROR. Otherwise, output all winning ticket numbers held by this employee in the same order of input. If no ticket wins, output an empty line instead. Sample Input: 10 PAT000001 1 PAT000003 5 PAT000002 4 PAT000010 20 PAT000001 2 PAT000008 7 PAT000010 18 PAT000003 -5 PAT102030 -2000 PAT000008 15 11 1 10 2 PAT000008 2 PAT000001 3 -10 1 9999 1 -10 3 2 1 0 3 1 2 PAT000001 3 -2000 Sample Output: PAT000008 15 ERROR ERROR PAT000003 PAT000001 PAT000001 PAT000001 1 2 PAT102030
最新发布
08-12
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