Create 1291-sequential-digits.kt

Author: a93a

kotlin/1291-sequential-digits.kt

@@ -0,0 +1,18 @@
+class Solution {
+    fun sequentialDigits(low: Int, high: Int): List<Int> {
+        var q = mutableListOf(1, 2, 3, 4, 5, 6, 7, 8, 9)
+        var res = mutableListOf<Int>()
+
+        while (q.isNotEmpty()) {
+            var n = q.removeFirst()
+
+            if (n > high) continue
+            if (n >= low) res.add(n)
+
+            val d = n % 10
+            if (d < 9) q.add(n * 10 + (d + 1))
+        }
+
+        return res
+    }
+}