Modified

Author: Rezwan

Diff for: 1068. Sum.py

@@ -0,0 +1,9 @@
+n = int(input())
+if n <= 0:
+    n = -n
+    sm = n*(n+1) // 2
+    sm = -sm + 1
+    print(sm)
+else:
+    sm = n*(n+1) // 2
+    print(sm)

Diff for: Conditional Statements.py

@@ -99,6 +99,19 @@
 '''
 
 
+
+########## Leaf Year
+year = int(input())
+
+if( year%400 == 0 or (year%100 != 0 and year%4 == 0) ):
+    print('%d is leaf year.' % year)
+else:
+    print('%d is not leaf year.' % year)
+
+
+
+
+
 '''
 ** You are now able to solve following online-judge problems.
 ------------------------------------------------------------