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Zigzag conversion leetcode solution.

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 Zigzag conversion leetcode solution.


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 s, int numRows);
 

Example 1:

Input: s = "PAYPALISHIRING", numRows = 3
Output: "PAHNAPLSIIGYIR"

Example 2:

Input: s = "PAYPALISHIRING", numRows = 4
Output: "PINALSIGYAHRPI"
Explanation:
P     I    N
A   L S  I G
Y A   H R
P     I

Example 3:

Input: s = "A", numRows = 1
Output: "A"
 

Constraints:

1 <= s.length <= 1000
s consists of English letters (lower-case and upper-case), ',' and '.'.
1 <= numRows <= 1000


Solution in C++:- 

class Solution {
public:
	string convert(string s, int numRows) {
		string data [numRows];
		int size = s.size();
		int r = 2 * numRows - 2;

		for(int i = 0; i < size; i ++)
		{
			if(r == 0 || size == 1)
				return s;
			else
			{
				int temp = i%r;
				if(temp < numRows)
					data[temp] += s[i];
				else
					data[2 * numRows - temp - 2] += s[i];
			}
		}

		string result = "";
		for(int i = 0; i < numRows; i ++)
			result += data[i];

		return result;
	}
};



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