LeetCode-in-Java
1837. Sum of Digits in Base K
Easy
Given an integer n (in base 10) and a base k, return the sum of the digits of n after converting n from base 10 to base k.
After converting, each digit should be interpreted as a base 10 number, and the sum should be returned in base 10.
Example 1:
Input: n = 34, k = 6
Output: 9
Explanation: 34 (base 10) expressed in base 6 is 54. 5 + 4 = 9.
Example 2:
Input: n = 10, k = 10
Output: 1
Explanation: n is already in base 10. 1 + 0 = 1.
Constraints:
1 <= n <= 1002 <= k <= 10
Solution
public class Solution {
public int sumBase(int n, int k) {
String str = Integer.toString(Integer.parseInt(n + "", 10), k);
int sum = 0;
for (char c : str.toCharArray()) {
sum += Character.getNumericValue(c);
}
return sum;
}
}