add new solutions

solutions/q209/solution.go

@@ -0,0 +1,26 @@
+package q209
+
+import "math"
+
+func minSubArrayLen(target int, nums []int) int {
+	minLen := math.MaxInt
+
+	l, sum := 0, 0
+	for r := range nums {
+		sum += nums[r]
+		for l < r && sum-nums[l] >= target {
+			sum -= nums[l]
+			l++
+		}
+		if sum >= target {
+			minLen = min(minLen, r-l+1)
+		}
+	}
+
+	if minLen == math.MaxInt {
+		return 0
+	}
+	return minLen
+}
+
+var _ = minSubArrayLen