Problem
Given an integer num, return **a string of its *base 7* representation**.
Example 1:
Input: num = 100
Output: "202"
Example 2:
Input: num = -7
Output: "-10"
Constraints:
-10^7 <= num <= 10^7
Solution (Java)
class Solution {
public String convertToBase7(int num) {
return Integer.toString(num, 7);
}
}
Explain:
nope.
Complexity:
- Time complexity : O(n).
- Space complexity : O(n).