Huba's book testcase generation

import random

answer = True
maxint = 1000
numrandom = 10000
books = list(set([random.randint(1, maxint) for _ in range(numrandom)]))

if answer:
     #a random set of integers will be a positive example with a very high probability. 
    selected_books = books
else:
    selected_books = []
    sums = set()

    for i, book in enumerate(books):
        violation = False
        for book2 in selected_books:
            if book+book2 in sums:
                violation = True
        if violation:
            continue
        else:
            for book2 in selected_books:
                sums.add(book + book2)
            selected_books.append(book)

print(' '.join([str(i) for i in selected_books]))

sums = set()
found = False
for i in range(len(selected_books)):
    for j in range(i+1, len(selected_books)):
        if (selected_books[i] + selected_books[j]) in sums:
            found=True
        else:
            sums.add(selected_books[i] + selected_books[j])
if found:
    print('YES')
else:
    print('NO')