add: leetcode 0846 solution

leetcode/0846.Hand-of-Straights/846.Hand of Straights.go

@@ -0,0 +1,23 @@
+package leetcode
+
+import "sort"
+
+func isNStraightHand(hand []int, groupSize int) bool {
+	mp := make(map[int]int)
+	for _, v := range hand {
+		mp[v] += 1
+	}
+	sort.Ints(hand)
+	for _, num := range hand {
+		if mp[num] == 0 {
+			continue
+		}
+		for diff := 0; diff < groupSize; diff++ {
+			if mp[num+diff] == 0 {
+				return false
+			}
+			mp[num+diff] -= 1
+		}
+	}
+	return true
+}