Create similar-rgb-color.cpp

Author: kamyu104

C++/similar-rgb-color.cpp

@@ -0,0 +1,24 @@
+// Time:  O(1)
+// Space: O(1)
+
+class Solution {
+public:
+    string similarRGB(string color) {
+        string result = "#";
+        result += round(color.substr(1, 2));
+        result += round(color.substr(3, 2));
+        result += round(color.substr(5, 2));
+        return result;
+    }
+
+private:
+    string round(const string& color) {
+        std::stringstream in(color);
+        int decimal = 0;
+        in >> std::hex >> decimal;
+        decimal = decimal / 17 + (decimal % 17 > 8 ? 1 : 0);
+        std::stringstream out;
+        out << std::setfill('0') << std::setw(2) << std::hex <<  17 * q;
+        return out.str();
+    }
+};