1.Title : The string "PAYPALISHIRING" is written in a zigzag pattern on a given number of rows like this: (you may want to display this pattern in a fixed font for better legibility)

P   A   H   N
A P L S I I G
Y   I   R

string convert(string text, int nRows);

2.pseudocode :

 1 creat data structure:
 2     the given number of rows  →  nRows;
 3     the given text string  →  s;
 4     stringBuffer[] to restore result  →  sb;
 5 set char position index i = 0;row position index j = 0;combing outcome index k = 1;
 
 6 while i < the length of s,then
 7     for each j from 0 to (nRows - 1)
 8         append the ith char of s to sb[j];
 9         i++;
10     end
11     for each j from (nRows - 2) to 1
12         append the ith char of s to sb[j];
13         i++;
14     end
15 end
16 //form a united outcome
17 for each k from 1 to (nRows - 1)
 
18     append sb[k] to sb[0];
19 end
20 terminate and output sb[0];

pseudocode of zigzag conversion