Update sum-of-all-numbers-gettaplay.py

the-vampiire · Oct 13, 2018 · 55c4be8 · 55c4be8
1 parent 0a01dce
commit 55c4be8
Showing 1 changed file with 6 additions and 8 deletions.
diff --git a/beginner/sum-of-all-numbers-gettaplay.py b/beginner/sum-of-all-numbers-gettaplay.py
@@ -1,10 +1,8 @@
 def sum_all(li):
-    sum = 0
-    start = min(li)
-    stop = max(li)
-    for i in range(start,stop+1):
-        sum += i
-    return sum
-
+    a=min(li)
+    b=max(li)
+    n=b-a+1
+    return (n*(a+b)/2)
 print(sum_all([1,4]))
-print(sum_all([4,1]))
+print(sum_all([4,1]))
+print(sum_all([10,15]))