leetcode Count and Say

代码：

#include<iostream>
#include<string>
#include<vector>

using namespace std;


string countAndSay(int n) 
{
    string s = "1";
    int i = 0; 
    while (--n > 0)
    {
        char c = s[0];
        string b = "";
        i = 0;
        while (i < s.length())
        {
            i++;
            int count = 1;
            while (i<s.length()&&s[i] == c)
            {
                count++;
                i++;
            }
            b = b + (char)(count + '0');
            b = b + c;
            if (i == s.length())
            {
                break;
            }
            c = s[i];
        }
        s = b;
    }
    return s;
}

int main()
{
    cout << countAndSay(2) << endl;
}