Tags: python
Rating:
## A numbers game (PPC, 50p)
Description: People either love or hate math. Do you love it? Prove it! You just need to solve a bunch of equations without a mistake.
###ENG
[PL](#pl-version)
Server sends input in format:
Hi, I heard that you're good in math. Prove it!
Level 1.: x - 18 = -12
And we are supposed to send the solution to the equation.
So for the example above we parse `-` as operation, `18` as operand and `-12` as result, and thus the solution is `-12 + 18`.
We automate is wih a simple script that parses operation, operand and result and then applies corresponding operation (eg. + for -).
```python
import re
import socket
from time import sleep
def main():
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect(("188.166.133.53", 11027))
regex = "Level \d+\.: x (.) (\d+) = (.+)"
initial_data = str(s.recv(4096))
print(initial_data)
while True:
sleep(1)
task = str(s.recv(4096))
m = re.search(regex, task)
print(task)
operation = m.group(1)
operand = int(m.group(2))
result = int(m.group(3))
x = result
if operation == "+":
x = result - operand
elif operation == "-":
x = result + operand
elif operation == "*":
x = result / operand
elif operation == "/":
x = result * operand
s.sendall(str(x) + "\n")
pass
main()
```
After 100 examples we get a flag: `IW{M4TH_1S_34SY}`
###PL version
Serwer dostarcza dane w formacie:
Hi, I heard that you're good in math. Prove it!
Level 1.: x - 18 = -12
A naszym zadaniem jest rozwiązać podane równanie.
Dla przykładu powyżej parsujemy `-` jako operacje, `18` jako operand oraz `-12` jako wynik, więc rozwiązaniem jest `-12 + 18`.
Automatyzujemy to skryptem który parsuje operacje, operand oraz wynik a nastepnie wykorzystuje operacje przeciwną (np. + dla -).
```python
import re
import socket
from time import sleep
def main():
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect(("188.166.133.53", 11027))
regex = "Level \d+\.: x (.) (\d+) = (.+)"
initial_data = str(s.recv(4096))
print(initial_data)
while True:
sleep(1)
task = str(s.recv(4096))
m = re.search(regex, task)
print(task)
operation = m.group(1)
operand = int(m.group(2))
result = int(m.group(3))
x = result
if operation == "+":
x = result - operand
elif operation == "-":
x = result + operand
elif operation == "*":
x = result / operand
elif operation == "/":
x = result * operand
s.sendall(str(x) + "\n")
pass
main()
```
Po 100 przykładach dostajemy flagę: `IW{M4TH_1S_34SY}`
