add 0910 smallest-range-ii

leetcode/0910-Smallest-Range-II/910.Smallest Range II.go

@@ -0,0 +1,31 @@
+package leetcode
+
+import "sort"
+
+func SmallestRangeII(A []int, K int) int {
+	n := len(A)
+	sort.Ints(A)
+	var ans int = A[n-1] - A[0]
+	for i := 0; i < n-1; i++ {
+		a, b := A[i], A[i+1]
+		high := max(A[n-1]-K, a+K)
+		low := min(A[0]+K, b-K)
+		ans = min(ans, high-low)
+	}
+
+	return ans
+}
+
+func max(a, b int) int {
+	if a > b {
+		return a
+	}
+	return b
+}
+
+func min(a, b int) int {
+	if a < b {
+		return a
+	}
+	return b
+}