Create largest-odd-number-in-string.cpp

Author: kamyu104

C++/largest-odd-number-in-string.cpp

@@ -0,0 +1,14 @@
+// Time:  O(n)
+// Space: O(1)
+
+class Solution {
+public:
+    string largestOddNumber(string num) {
+        for (int i = size(num) - 1; i >= 0; --i) {
+            if ((num[i] - '0') % 2) {
+                return num.substr(0, i + 1);
+            }
+        }
+        return "";
+    }
+};