Max swap

python/problem_670/README.md

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+# 670. Maximum Swap
+
+You are given an integer num. You can swap two digits at most once to get the maximum valued number.
+
+Return the maximum valued number you can get.
+
+
+
+Example 1:
+
+Input: num = 2736
+Output: 7236
+Explanation: Swap the number 2 and the number 7.
+
+Example 2:
+
+Input: num = 9973
+Output: 9973
+Explanation: No swap.
+
+
+
+Constraints:
+
+    0 <= num <= 108