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solve.py
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solve.py
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# coding=utf-8
def f1(flag):
y = flag[8]
x = flag[7]
flag[7] = flag[5]
flag[5] = y
flag[8] = flag[6]
flag[6] = x
flag[6] ^= 0x34
return flag
def f2(flag):
tmp = flag[7]
while True:
if tmp < flag[5]:
break
flag[6] += 1
tmp -= 1
return flag
def f3(flag):
x = flag[8]
while True:
flag[5] -= 1
x -= 1
if x == ord('0'):
break
return flag
def f4(flag):
x = flag[8]
y = flag[7]
flag[8] = flag[5]
flag[5] = x
flag[7] = flag[6]
flag[6] = y
return flag
def f5(flag):
flag[5] ^= 0x1a
flag[6] ^= 0x79
flag[7] ^= 0x46
flag[8] ^= 0x7c
return flag
flag = map(ord, "GH18{....}")
flag = f5(flag)
flag = f4(flag)
flag = f3(flag)
flag = f2(flag)
print(["".join(map(chr, flag))])