public class Solution {
public String convertToBase7(int num) {
if (num == 0)
return "0";
String res = "";
int temp = num;
int remainder = temp % 7;
while (temp!=0) {
res = String.valueOf(Math.abs(remainder)) + res;
temp /= 7;
remainder = temp % 7;
}
if (num < 0 )
res = "-" + res;
return res;
}
}
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