题目：

题解：

class Solution {
public:string countAndSay(int n) {string s = "1", ans = "1";for (int i = 2; i <= n; i++) {ans = "";for (int j = 0; j < int(s.size()); ) {int k = j;while(k < int(s.size()) && s[j] == s[k])++k;ans = ans + to_string(k - j) + s[j];j = k;}s = ans;}return ans;}
};