add Kotlin solution for 846. Hand of Straights

kotlin/0846-hand-of-straights.kt

@@ -0,0 +1,28 @@
+class Solution {
+ fun isNStraightHand(hand: IntArray, groupSize: Int): Boolean {
+ if (hand.size % groupSize != 0) return false
+ val countMap = mutableMapOf<Int, Int>()
+ hand.forEach { countMap[it] = countMap.getOrDefault(it, 0) + 1 }
+ val minHeap = PriorityQueue(countMap.keys)
+
+ while (minHeap.isNotEmpty()) {
+ val minValue = minHeap.peek()
+ if (countMap.getValue(minValue) == 0) {
+ minHeap.remove()
+ continue
+ }
+ // loop through consecutive numbers starting from the "minValue" number
+ for (consecutiveNumber in minValue until (minValue + groupSize)) {
+ if (
+ consecutiveNumber !in countMap.keys ||
+ countMap.getValue(consecutiveNumber) == 0
+ ) return false
+ countMap[consecutiveNumber] = countMap.getValue(consecutiveNumber) - 1
+ }
+ // if the loop successfully executes without returning, it indicates that
+ // it was possible to create a group of size [groupSize] with minValue
+ // as the first element in the group.
+ }
+ return true
+ }
+}