restructure solutions dir

solutions/1/q150/solution.go

@@ -0,0 +1,24 @@
+package q150
+
+func twoSum(numbers []int, target int) []int {
+	l, r := 0, len(numbers)-1
+
+	for l < r {
+		for numbers[r]+numbers[l] > target {
+			r--
+		}
+		if numbers[r]+numbers[l] == target {
+			return []int{l + 1, r + 1}
+		}
+
+		for numbers[r]+numbers[l] < target {
+			l++
+		}
+		if numbers[r]+numbers[l] == target {
+			return []int{l + 1, r + 1}
+		}
+	}
+	return []int{} // impossible
+}
+
+var _ = twoSum