Create maximum_combination.py

Author: mohammadreza490

maths/maximum_combination.py

@@ -0,0 +1,39 @@
+"""
+Source: https://www.instagram.com/p/CG7kv65A6s1/?utm_source=ig_web_copy_link
+
+The following function accepts 2 positive integers and makes the first number as large as possible by swapping out its digits for digits in second numebr
+>>> maximum_combination(9132,5564)
+9655
+>>> maximum_combination(523,76)
+763
+>>> maximum_combination(8732, 91255)
+9755
+>>> maximum_combination(6472,0)
+6472
+>>> maximum_combination(-12,10)
+0
+"""
+
+
+def maximum_combination(first_num, second_num):
+    if first_num <= 0:
+        return 0
+    if second_num <= 0:
+        return first_num
+    second_num = [int(x) for x in str(second_num)]
+    first_num = [int(x) for x in str(first_num)]
+    second_num.sort(reverse=True)
+    for index, val in enumerate(first_num):
+        if len(second_num) > 0:
+            if second_num[0] > val:
+                first_num[index] = second_num[0]
+                second_num.pop(0)
+        else:
+            break
+    return int("".join(map(str, first_num)))
+
+
+if __name__ == "__main__":
+    from doctest import testmod
+
+    testmod()