Create replace-all-digits-with-characters.cpp

Author: kamyu104

C++/replace-all-digits-with-characters.cpp

@@ -0,0 +1,12 @@
+// Time:  O(n)
+// Space: O(1)
+
+class Solution {
+public:
+    string replaceDigits(string s) {
+        for (int i = 1; i < size(s); i += 2) {
+            s[i] += s[i - 1] - '0';
+        }
+        return s;
+    }
+};