added: solution in python to find missing number challenge

challenges/easy/find-missing-number/solutions/valentinadagata/main.erl

@@ -0,0 +1,12 @@
+-module(main).
+-import(lists,[sum/1]).
+-export([start/0]).
+
+findMissingNumber(MyList) ->
+  Total = sum(lists:seq(lists:min(MyList), lists:max(MyList))),
+  MissingNum = Total - sum(MyList),
+  MissingNum.
+
+start() ->
+  MyList=[230, 222, 220, 224, 229, 221, 225, 223, 228, 226],
+  io:fwrite("~w~n", [findMissingNumber(MyList)]).

challenges/easy/find-missing-number/solutions/valentinadagata/main.py

@@ -0,0 +1,12 @@
+def find_missing_number(l):
+    # sort the list to get the min and the max taking the first and the last item
+    l.sort()
+    # total list = sum all the numbers between the min and the max of the list
+    # difference between the total list and the list will be the missing number
+    n = sum(range(l[0], l[len(l)-1] + 1)) - sum(l)
+    return n
+
+
+if __name__ == '__main__':
+    mylist = [230, 222, 220, 224, 229, 221, 225, 223, 228, 226]
+    print(find_missing_number(mylist))