Base 7

2017/12/9 posted in  leetcode 

class Solution {
public:
    string convertToBase7(int num) {
        int x = abs(num); string res;
        do {
          res = to_string(x%7)+res;
        } while (x/=7);
        
        return (num>=0? "" : "-") + res;
    }
};

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