class Solution {
public:
string convertTo7(int num) {
string sign = "";
string rst = "";
if (num < 0) {
num = -num;
sign = "-";
}
while (num >= 7) {
int left = num % 7;
num = num / 7;
rst = to_string(left) + rst;
}
return sign + to_string(num) + rst;
}
};
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