Problème
Afficher la traductionLook at every decimal digit of n and return the largest one.
Implement largest_digit(n).
Input
n: A positive integer.
Output
Return the largest digit, from 0 to 9.
Contraintes
1 ≤ n ≤ 10¹⁸
Exemples
Exemple 1
Entrée :
n = 352
Sortie attendue :
expected = 5Entrée :
long long n = 352;
Sortie attendue :
long long expected = 5;Entrée :
long n = 352;
Sortie attendue :
long expected = 5;Explication
The digits are 3, 5 and 2; the largest is 5.
Exemple 2
Entrée :
n = 7
Sortie attendue :
expected = 7Entrée :
long long n = 7;
Sortie attendue :
long long expected = 7;Entrée :
long n = 7;
Sortie attendue :
long expected = 7;Explication
The only digit is 7.