""" Sum of Pairs
Read each line from standard input and print the SOP until the end
of file or a blank line
e.g.
when groupdata.txt is:
1 2 3 4 5
10 20 30
c:\somewherewiththefiles>python SOP.py < groupdata.txt > SOPresult.txt
will write the result in SOPresult.txt as:
20
40"""
def getPairs(n):
"""get a list and return all pair combination of the list as a list"""
result=[]
for i1 in range(len(n)):
for i2 in range(i1+1,len(n)):
result.append((n[i1],n[i2]))
return result
def getAbsoluteSum(p):
"""get a list of pairs and return the abs sum of them"""
sum=0
for first,second in p:
sum+=abs(first-second)
return sum
if __name__=="__main__":
import sys
input=sys.stdin
while 1:
eachLine=input.readline()
if not eachLine or eachLine=='\n':
break
listLine= map(int,eachLine.split())
print getAbsoluteSum(getPairs(listLine))
#----
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 | SOP.py |
