add new solutions

solutions/8/q868/solution.go

@@ -0,0 +1,18 @@
+package q868
+
+func binaryGap(n int) int {
+	maxGap := -1
+	gap := -99
+	for n > 0 {
+		if n%2 == 0 {
+			gap++
+		} else {
+			maxGap = max(maxGap, gap)
+			gap = 0
+		}
+		n >>= 1
+	}
+	return maxGap + 1
+}
+
+var _ = binaryGap