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