contains duplicated solution

Author: youngDaLee

contains-duplicate/youngDaLee.go

@@ -0,0 +1,12 @@
+package youngDaLee
+
+func containsDuplicate(nums []int) bool {
+	numMap := make(map[int]bool)
+	for _, num := range nums {
+		if _, exists := numMap[num]; exists {
+			return true
+		}
+		numMap[num] = true
+	}
+	return false
+}