LeetCode/LeetCode-38.1.cpp at master · hello-sources/LeetCode · GitHub

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/*************************************************************************
    > File Name: LeetCode-38.1.cpp
    > Author: ltw
    > Mail: 3245849061@qq.com
    > Created Time: Sun 17 May 2020 02:27:51 PM CST
 ************************************************************************/

#include <iostream>
using namespace std;


class Solution {
public:
    string countAndSay(int n) {
        if (n == 1) return string("1");
        string pre_str = countAndSay(n - 1);;
        char str[10000];
        int ret = 0, num = pre_str[0], cnt = 1;
        for (int i = 1; pre_str[i]; i++) {
            if (pre_str[i] == num) cnt += 1;
            else {
                ret += sprintf(str + ret, "%d%c", cnt, num);
                num = pre_str[i];
                cnt = 1;
            }
        }
        ret += sprintf(str + ret, "%d%c", cnt, num);
        return str;
    }
};