Next Unique-digit Integer | tech::interview


Next Unique-digit Integer | tech::interview
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
int64_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;
}
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