Hammer To Fall

Dynamically sized integers huh (wrap the proper input in a flag wrapper kqctf{number})

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源文件:

import numpy as np

a = np.array([0], dtype=int)
val = int(input("This hammer hits so hard it creates negative matter\n"))
if val == -1:
	exit()
a[0] = val
a[0] = (a[0] * 7) + 1
print(a[0])
if a[0] == -1:
	print("flag!")

NumPy中的int使用的是C中的long,参照NumPy文档,最大值为9223372036854775807

>>> 9223372036854775807 // 7 * 2
2635249153387078802

flag:kqctf{2635249153387078802}