From cf0ebf0bdefe44515f422d1510543efed05e7e89 Mon Sep 17 00:00:00 2001
From: Edera <edera.marketinglab@gmail.com>
Date: Thu, 7 Oct 2021 23:43:31 +0200
Subject: [PATCH 1/4] added: solution in python to find missing number
 challenge

---
 .../solutions/valentinadagata/main.py                  | 10 ++++++++++
 1 file changed, 10 insertions(+)
 create mode 100644 challenges/easy/find-missing-number/solutions/valentinadagata/main.py

diff --git a/challenges/easy/find-missing-number/solutions/valentinadagata/main.py b/challenges/easy/find-missing-number/solutions/valentinadagata/main.py
new file mode 100644
index 0000000..5d7e73b
--- /dev/null
+++ b/challenges/easy/find-missing-number/solutions/valentinadagata/main.py
@@ -0,0 +1,10 @@
+def find_missing_number(l):
+    # 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(min(l), max(l) + 1)) - sum(l)
+    return n
+
+
+if __name__ == '__main__':
+    mylist = [230, 222, 220, 224, 229, 221, 225, 223, 228, 226]
+    print(find_missing_number(mylist))
\ No newline at end of file

From 39d2a9a10dfae4f3adc3eb86f8bce9b632dc2f2d Mon Sep 17 00:00:00 2001
From: Edera <edera.marketinglab@gmail.com>
Date: Sat, 9 Oct 2021 15:26:28 +0200
Subject: [PATCH 2/4] fix: sort the list and take the first and the last item
 to iterate only 1 time (instead of using max and min)

---
 .../find-missing-number/solutions/valentinadagata/main.py     | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/challenges/easy/find-missing-number/solutions/valentinadagata/main.py b/challenges/easy/find-missing-number/solutions/valentinadagata/main.py
index 5d7e73b..8db1d76 100644
--- a/challenges/easy/find-missing-number/solutions/valentinadagata/main.py
+++ b/challenges/easy/find-missing-number/solutions/valentinadagata/main.py
@@ -1,7 +1,9 @@
 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(min(l), max(l) + 1)) - sum(l)
+    n = sum(range(l[0], l[len(l)-1] + 1)) - sum(l)
     return n
 
 

From cacc49acc65cd01ca86a2c9b56c884e2ea37e9ea Mon Sep 17 00:00:00 2001
From: Edera <edera.marketinglab@gmail.com>
Date: Sun, 10 Oct 2021 13:57:34 +0200
Subject: [PATCH 3/4] added: my solution in erlang

---
 .../solutions/valentinadagata/main.erl                 | 10 ++++++++++
 1 file changed, 10 insertions(+)
 create mode 100644 challenges/easy/find-missing-number/solutions/valentinadagata/main.erl

diff --git a/challenges/easy/find-missing-number/solutions/valentinadagata/main.erl b/challenges/easy/find-missing-number/solutions/valentinadagata/main.erl
new file mode 100644
index 0000000..44eb902
--- /dev/null
+++ b/challenges/easy/find-missing-number/solutions/valentinadagata/main.erl
@@ -0,0 +1,10 @@
+-module(main).
+-import(lists,[sum/1]).
+-export([start/0]).
+
+start() ->
+  MyList=[230, 222, 220, 224, 229, 221, 225, 223, 228, 226],
+  Total = sum(lists:seq(lists:min(MyList), lists:max(MyList))),
+  MissingNum = Total - sum(MyList),
+  io:fwrite("~w~n", [MissingNum]),
+  MissingNum.

From 642b89cfd916c98b8885e560d0ae2bcabecd81a7 Mon Sep 17 00:00:00 2001
From: Edera <edera.marketinglab@gmail.com>
Date: Sun, 24 Oct 2021 18:45:22 +0200
Subject: [PATCH 4/4] findMissingNumber function was created to return the
 result

---
 .../solutions/valentinadagata/main.erl                    | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/challenges/easy/find-missing-number/solutions/valentinadagata/main.erl b/challenges/easy/find-missing-number/solutions/valentinadagata/main.erl
index 44eb902..9c08fab 100644
--- a/challenges/easy/find-missing-number/solutions/valentinadagata/main.erl
+++ b/challenges/easy/find-missing-number/solutions/valentinadagata/main.erl
@@ -2,9 +2,11 @@
 -import(lists,[sum/1]).
 -export([start/0]).
 
-start() ->
-  MyList=[230, 222, 220, 224, 229, 221, 225, 223, 228, 226],
+findMissingNumber(MyList) ->
   Total = sum(lists:seq(lists:min(MyList), lists:max(MyList))),
   MissingNum = Total - sum(MyList),
-  io:fwrite("~w~n", [MissingNum]),
   MissingNum.
+
+start() ->
+  MyList=[230, 222, 220, 224, 229, 221, 225, 223, 228, 226],
+  io:fwrite("~w~n", [findMissingNumber(MyList)]).