Create 1323_Maximum_69_Number.cpp

Author: HSUAN221

1323_Maximum_69_Number.cpp

@@ -0,0 +1,20 @@
+class Solution {
+ public:
+    int maximum69Number (int num) {
+        auto str = std::to_string(num);
+        auto switchChar = [](char c) -> char {
+            if (c == '9') {
+                c = '6';
+            } else if (c == '6') {
+                c = '9';
+            }
+            return c;
+        };
+        for (size_t i = 0; i < str.size(); ++i) {
+            str[i] = switchChar(str[i]);
+            num = std::max(num, std::stoi(str));
+            str[i] = switchChar(str[i]);
+        }
+        return num;
+    }
+};