Counterpart

Question

For a number n, we shall define it's k counterpart as the amount needed to be added to n to make it equal to k.

For example,
For 2, the 5 counterpart is 3
For 2, the 10 counterpart is 8
For 27, the 12 counterpart is -15

Complete the given method solve which takes as parameter a list A and a number k.

You have to find out whether the the first element's k counterpart exists in the rest of the list. If yes, print Exists. Otherwise, print Doesn't Exist

Example Input:
10 24 91 8 7 3
13

Output:
Exists

Explanation: 10's 13 counterpart is 3, which exists in the list

Answer 1

list1 = input().split()
cpart = int(input())
needed = cpart - int(list1[0])
if str(needed) in list1:
print("Exists")
else:
print("Does not Exist.")

Answer 2

def counterPart(alist,num):

result="Doesn't Exist"

for n in alist:

if (n-num) in alist:
result="Exists"
break

print(result)

counterPart([24,91,8,7,3,13],10)