[LeetCode] 6. Zigzag Conversion (Kotlin)

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

Zigzag Conversion - LeetCode

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class Solution {
    fun convert(s: String, numRows: Int): String {
        var direction = 0
        var zigzagIdx = 0
        val zigzagTable = mutableMapOf<Int, String>()
        s.forEach {
            if (zigzagIdx == 0) {
                direction = 1 // down(index plus)
            } else if(zigzagIdx == numRows - 1) {
                direction = -1 // up(index minus)
            }

            zigzagTable.set(
                key = zigzagIdx,
                value = zigzagTable.getOrDefault(zigzagIdx, "") +it
            )
            zigzagIdx += direction
        }
        return zigzagTable.values.joinToString("")
    }
}

https://github.com/960813/leetcode-problems/commit/073a633dc09ee2539adf2d973e2b191bb0820c5d

[6] Kotlin · 960813/leetcode-problems@073a633

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