LeetCode: 6. ZigZag Conversion

Problem: 6. ZigZag Conversion

Link: https://leetcode.com/problems/zigzag-conversion/

Algorithm: https://www.youtube.com/watch?v=nbTSfrEfo6M

Difficulty: Medium

Description:

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

Solution: 

Language: Swift

Runtime: 92ms
Memory: 4.1MB