diff --git a/C++/smallest-range-i.cpp b/C++/smallest-range-i.cpp
new file mode 100644
index 000000000..63a7bb6a5
--- /dev/null
+++ b/C++/smallest-range-i.cpp
@@ -0,0 +1,11 @@
+// Time:  O(n)
+// Space: O(1)
+
+class Solution {
+public:
+    int smallestRangeI(vector<int>& A, int K) {
+        return max(0, *max_element(A.cbegin(), A.cend()) -
+                      *min_element(A.cbegin(), A.cend()) -
+                      2 * K);
+    }
+};