51 -leetcode 38 -字符串

// LeetCode 38 字符串 to_string int to string char 直接变为string
//边界情况 for int i=0 i<.size() 比较的活 i+1 与i 比 i<size -1; 从第二个开始
class Solution {
public:
    string countAndSay(int n) {
        string res ="1";
        string tem = "";
        int count =0;
        while(--n)
        {
            tem = res;
            res ="";
            for(int i=0;i < tem.length();i++)
            {
                count = 1;
                while(i<(tem.length()-1)&&(tem[i+1] == tem[i])  )
                {
                    count++;
                    i++;
                }
                res += to_string(count) + tem[i];
            }
        }
        return res;
    }
};