Problem
Look at every decimal digit of n and return the smallest one. Zeros inside the number count.
Implement smallest_digit(n).
Input
n: A positive integer.
Output
Return the smallest digit, from 0 to 9.
Constraints
1 ≤ n ≤ 10¹⁸
Examples
Example 1
Input:
n = 352
Expected output:
expected = 2Input:
long long n = 352;
Expected output:
long long expected = 2;Input:
long n = 352;
Expected output:
long expected = 2;Explanation
The digits are 3, 5 and 2; the smallest is 2.
Example 2
Input:
n = 1203
Expected output:
expected = 0Input:
long long n = 1203;
Expected output:
long long expected = 0;Input:
long n = 1203;
Expected output:
long expected = 0;Explanation
The 0 inside the number is the smallest digit.