Leetcode 38. Count and Say

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

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

Given an integer n, generate the nth sequence.

Note:the sequence of integers would be represented as a string.

The meaning of the subject to understand, I just started not to understand what the meaning of

1.1

2.11

3.21

4.1211

5.111221

Count and say this is how to enter 1 Output 1, the second line is regular, the first line is a 1, the second row of the string is a 1 connected to 11

Similarly the third line is 2 1, the fourth line is a 2, a 1 ....

Understand the meaning of the topic, it will not be so difficult to do

classSolution { Public:    stringCountandsay (intN) {stringPre ="1", current;  for(inti =2; I <= n;++i) { current=""; CharPrechar = pre[0]; intCount =0;  for(intj =1; J < Pre.size (); + +j) {++count; if(Pre[j]! =Prechar) {Current.insert (current),Char(Count + -));                                        Current.insert (End (current), Prechar); Prechar=Pre[j]; Count=0; }} current.insert (current),Char(Count +1+ -));            Current.insert (End (current), Prechar); Pre=Current ; }        returnPre; }};

Leetcode 38. Count and Say