[GXYCTF2019]StrongestMind

Enter the page , Say yes a thousand times flag, Script boy rushed out ：

import re
import requests
from time import sleep


def count():
    s = requests.session()
    url = 'http://af42a67c-c7e4-45f2-961d-30c8591b3c30.node4.buuoj.cn:81/'
    match = re.compile(r"[0-9]+ [+|-] [0-9]+")
    r = s.get(url)
    for i in range(1001):
        sleep(0.1)
        str = match.findall(r.text)[0]
        # print(eval(str))
        data = {"answer" : eval(str)}
        r = s.post(url, data=data)
        r.encoding = "utf-8"
        #print('{} : {}'.format(i,eval(str)))
        # print(r.text)
    print(r.text)



if __name__ == '__main__':
    count()

Here I omit the process , Not stuck for a long time , If you want to see the process, remove it directly #print('{} : {}'.format(i,eval(str))) Just the previous comments , obtain flag