add new solutions

solutions/6/q643/solution.go

@@ -0,0 +1,23 @@
+package q643
+
+import "math"
+
+func findMaxAverage(nums []int, k int) float64 {
+	var maxSum = math.MinInt
+
+	sum := 0
+	for i := range nums {
+		if i < k-1 {
+			sum += nums[i]
+		} else {
+			sum += nums[i]
+			if i >= k {
+				sum -= nums[i-k]
+			}
+			maxSum = max(maxSum, sum)
+		}
+	}
+	return float64(maxSum) / float64(k)
+}
+
+var _ = findMaxAverage