LeetCode – Refresh – Count and Say

Pretty straight forward. count numbers and put char.

class Solution {
public:
    string getNext(string s) {
        ostringstream oss;
        char rec = s[0];
        int len = s.size(), num = 1;
        for (int i = 1; i < len; i++) {
            if (rec != s[i]) {
                oss << char(num + '0') << rec;
                rec = s[i];
                num = 1;
            } else num++;
        }
        oss << char(num + '0') << rec;
        return oss.str();
    }
    string countAndSay(int n) {
        string result = "1";
        for (int i = 2; i <= n; i++) {
            result = getNext(result);
        }
        return result;
    }
};