最近研究輸出字符串，稍微總結一下，以后繼續補充：

????標題如下：

????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 n ^th sequence.

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

????分析：題意是n=1時輸出字符串1；n=2時，數前次字符串中的數值個數，因為前次字符串有1個1，所以輸出11；n=3時，由于前次字符是11，有2個1，所以輸出21；n=4時，由于前次字符串是21，有1個2和1個1，所以輸出1211；順次類推。

????此題我沒有找到數學律規，且暫就用最簡略的法想做，關鍵是考核string的作操。

????碼代如下：

?string numbertostring(int & num)
??? {
??????? string tmp;
??????? if(num<=9)
??????? {
?????????? tmp.push_back(num + '0');
??????? }
??????? else
??????? {
??????????? vector<int> over10num;??????????????????????????????? ?
??????????? while(num>0)??????????????????????????????? ?
??????????? {??????????????????????????????????? ?
??????????????? over10num.push_back(num%10);
??????????????? num = num/10;??????????????????????????????? ?
??????????? }??????????????????????????????? ?
??????????? int len_num = over10num.size();??????????????????????????????? ?
??????????? for(int k=len_num-1;k>=0;--k)
??????????? {
??????????????? tmp.push_back(over10num[k] + '0');
??????????? }
??????? }
??????? return tmp;
??? }
??? string countAndSay(int n) {
??????? string s;
??????? if(n<=0)return s;
??????? s.push_back('1');
??????? int number=1;
??????? while(number!=n)
??????? {
??????????? string tmp;
??????????? int length = s.length();
??????????? for(int i=0;i<length;)
??????????? {
??????????????? int num=1,j=i+1;
??????????????? while(j<length&&s[j]==s[i])
??????????????? {
??????????????????? num++;
??????????????????? j++;
??????????????? }
??????????????? tmp+=numbertostring(num);
??????????????? tmp+=s[i];
??????????????? i=j;
??????????? }
??????????? number++;
??????????? s=tmp;
??????? }
??????? return s;
??? }

????

文章結束給大家分享下程序員的一些笑話語錄： 據說有一位軟件工程師，一位硬件工程師和一位項目經理同坐車參加研討會。不幸在從盤山公路下山時壞在半路上了。于是兩位工程師和一位經理就如何修車的問題展開了討論。
硬件工程師說：“我可以用隨身攜帶的瑞士軍刀把車壞的部分拆下來，找出原因，排除故障?！?
項目經理說：“根據經營管理學，應該召開會議，根據問題現狀寫出需求報告，制訂計劃，編寫日程安排，逐步逼近，alpha測試，beta1測試和beta2測試解決問題?！?
軟件工程說：“咱們還是應該把車推回山頂再開下來，看看問題是否重復發生?！?

輸出字符串Count and Say