Create 0838-push-dominoes.kt

kotlin/0838-push-dominoes.kt

@@ -0,0 +1,30 @@
+class Solution {
+ fun pushDominoes(d: String): String {
+ val domArr = d.toCharArray()
+ val q = LinkedList<Pair<Int, Char>>()
+
+ for ((i, v) in domArr.withIndex()) {
+ if (v != '.')
+ q.addLast(i to v)
+ }
+
+ while (q.isNotEmpty()) {
+ val (i, v) = q.removeFirst()
+ if (v == 'L' && i > 0 && domArr[i - 1] == '.') { 
+ q.addLast(i - 1 to 'L')
+ domArr[i - 1] = 'L'
+ } else if (v == 'R') {
+ if (i + 1 < domArr.size && domArr[i + 1] == '.') {
+ if (i + 2 < domArr.size && domArr[i + 2] == 'L') {
+ q.removeFirst()
+ } else {
+ q.addLast(i + 1 to 'R')
+ domArr[i + 1] = 'R'
+ }
+ }
+ }
+ }
+
+ return String(domArr)
+ }
+}