LeetCode Count and Say

The count-and-say sequence is the sequence of integers beginning as follows:
1, 11, 21, 1211, 111221, ...

1 is read off as "one 1" or 11.
11 is read off as "two 1s" or 21.
21 is read off as "one 2, then one 1" or 1211.

Given an integer n, generate the nth sequence.

Note: The sequence of integers will be represented as a string.

思路：单纯的模拟

class Solution {
public:
    string countAndSay(int n) {
        string ans = "1";
        for (int i = 1; i < n; i++) {
            int count = 1;
            string tmp = "";
            for (int j = 1; j < ans.size(); j++) {
                if (ans[j] == ans[j-1]) {
                    count++;
                } else {
                    tmp = tmp + (char)(count + '0') + ans[j-1];
                    count = 1;
                }
            }
            ans = tmp + (char)(count + '0') + ans[ans.size()-1];
        }

        return ans;
    }
};

LeetCode Count and Say

原文：http://blog.csdn.net/u011345136/article/details/44037151