leetcode6. ZigZag Conversion

easy程度题

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

And then read line by line:  "PAHNAPLSIIGYIR"

Write the code that will take a string and make this conversion given a number of rows:

string convert(string text, int nRows);

convert("PAYPALISHIRING", 3) should return "PAHNAPLSIIGYIR"

给一个字符串，把它按Z形排列，然后按行输出。

class Solution 
{
public:
    string convert(string s, int numRows) 
    {
        string add[numRows];
        
        int j,i=0,m;
        while(i<s.size())
        {
            for(j=0;i<s.size()&&j<numRows;j++)
                add[j]+=s[i++];
            for(j=numRows-2;i<s.size()&&j>0;j--)
                add[j]+=s[i++];
        }
        
        string  result="";
        for(int i=0;i<numRows;i++)
            result+=add[i];
            
        return result;
    }
};