BUUOJ rev equation1

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buuoj [reverse] equation

上来就一个套着html文件的js代码，有jsfuck的混淆。题目名字提示有方程组（equation），很明显方程组就是这个被混淆的部分。

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这里每一行本来是用&&连起来的，每一行里面又都有==，因为jsfuck没有用到==，所以可以分开。

上手就是JavaScript还用上了regexpr，

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const fs = require('fs');
const readline = require('readline');

function solve() {
    const fileStream = fs.createReadStream('equation.html');
    const rl = readline.createInterface({
        input: fileStream
    });
    rl.on('line', function(line) {
        let re = /l\[[\[\]\+!\-]+\]/g;
        let result = line.matchAll(re);
        for (const item of result) {
            const val = eval(('' + item).slice(2, -1));
            line = line.replace(`${('' + item).slice(2, -1)}`, `${val}`);
        }
        const right = line.split('==')[1];
        const val = eval(right);
        line = line.replace(right, `${val}`);
        console.log(`${line}`);
    });
}

solve();

要用z3解方程组，不得不再找python。（不情愿

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import z3
from z3.z3 import BitVec

s = z3.Solver()

l = [z3.Int('bv_{}'.format(i)) for i in range(0x2a)]

s.add(l[40]+l[35]+l[34]-l[0]-l[15]-l[37]+l[7]+l[6]-l[26]+l[20]+l[19]+l[8]-l[17]-l[14]-l[38]+l[1]-l[9]+l[22]+l[41]+l[3]-l[29]-l[36]-l[25]+l[5]+l[32]-l[16]+l[12]-l[24]+l[30]+l[39]+l[10]+l[2]+l[27]+l[28]+l[21]+l[33]-l[18]+l[4]==861)
s.add(l[31]+l[26]+l[11]-l[33]+l[27]-l[3]+l[12]+l[30]+l[1]+l[32]-l[16]+l[7]+l[10]-l[25]+l[38]-l[41]-l[14]-l[19]+l[29]+l[36]-l[9]-l[28]-l[6]-l[0]-l[22]-l[18]+l[20]-l[37]+l[4]-l[24]+l[34]-l[21]-l[39]-l[23]-l[8]-l[40]+l[15]-l[35]==-448)
s.add(l[26]+l[14]+l[15]+l[9]+l[13]+l[30]-l[11]+l[18]+l[23]+l[7]+l[3]+l[12]+l[25]-l[24]-l[39]-l[35]-l[20]+l[40]-l[8]+l[10]-l[5]-l[33]-l[31]+l[32]+l[19]+l[21]-l[6]+l[1]+l[16]+l[17]+l[29]+l[22]-l[4]-l[36]+l[41]+l[38]+l[2]+l[0]==1244)
s.add(l[5]+l[22]+l[15]+l[2]-l[28]-l[10]-l[3]-l[13]-l[18]+l[30]-l[9]+l[32]+l[19]+l[34]+l[23]-l[17]+l[16]-l[7]+l[24]-l[39]+l[8]-l[12]-l[40]-l[25]+l[37]-l[35]+l[11]-l[14]+l[20]-l[27]+l[4]-l[33]-l[21]+l[31]-l[6]+l[1]+l[38]-l[29]==-39)
s.add(l[41]-l[29]+l[23]-l[4]+l[20]-l[33]+l[35]+l[3]-l[19]-l[21]+l[11]+l[26]-l[24]-l[17]+l[37]+l[1]+l[16]-l[0]-l[13]+l[7]+l[10]+l[14]+l[22]+l[39]-l[40]+l[34]-l[38]+l[32]+l[25]-l[2]+l[15]+l[6]+l[28]-l[8]-l[5]-l[31]-l[30]-l[27]==485)
s.add(l[13]+l[19]+l[21]-l[2]-l[33]-l[0]+l[39]+l[31]-l[23]-l[41]+l[38]-l[29]+l[36]+l[24]-l[20]-l[9]-l[32]+l[37]-l[35]+l[40]+l[7]-l[26]+l[15]-l[10]-l[6]-l[16]-l[4]-l[5]-l[30]-l[14]-l[22]-l[25]-l[34]-l[17]-l[11]-l[27]+l[1]-l[28]==-1068)
s.add(l[32]+l[0]+l[9]+l[14]+l[11]+l[18]-l[13]+l[24]-l[2]-l[15]+l[19]-l[21]+l[1]+l[39]-l[8]-l[3]+l[33]+l[6]-l[5]-l[35]-l[28]+l[25]-l[41]+l[22]-l[17]+l[10]+l[40]+l[34]+l[27]-l[20]+l[23]+l[31]-l[16]+l[7]+l[12]-l[30]+l[29]-l[4]==939)
s.add(l[19]+l[11]+l[20]-l[16]+l[40]+l[25]+l[1]-l[31]+l[28]-l[23]+l[14]-l[9]-l[27]+l[35]+l[39]-l[37]-l[8]-l[22]+l[5]-l[6]+l[0]-l[32]+l[24]+l[33]+l[29]+l[38]+l[15]-l[2]+l[30]+l[7]+l[12]-l[3]-l[17]+l[34]+l[41]-l[4]-l[13]-l[26]==413)
s.add(l[22]+l[4]-l[9]+l[34]+l[35]+l[17]+l[3]-l[24]+l[38]-l[5]-l[41]-l[31]-l[0]-l[25]+l[33]+l[15]-l[1]-l[10]+l[16]-l[29]-l[12]+l[26]-l[39]-l[21]-l[18]-l[6]-l[40]-l[13]+l[8]+l[37]+l[19]+l[14]+l[32]+l[28]-l[11]+l[23]+l[36]+l[7]==117)
s.add(l[32]+l[16]+l[3]+l[11]+l[34]-l[31]+l[14]+l[25]+l[1]-l[30]-l[33]-l[40]-l[4]-l[29]+l[18]-l[27]+l[13]-l[19]-l[12]+l[23]-l[39]-l[41]-l[8]+l[22]-l[5]-l[38]-l[9]-l[37]+l[17]-l[36]+l[24]-l[21]+l[2]-l[26]+l[20]-l[7]+l[35]-l[0]==-313)
s.add(l[40]-l[1]+l[5]+l[7]+l[33]+l[29]+l[12]+l[38]-l[31]+l[2]+l[14]-l[35]-l[8]-l[24]-l[39]-l[9]-l[28]+l[23]-l[17]-l[22]-l[26]+l[32]-l[11]+l[4]-l[36]+l[10]+l[20]-l[18]-l[16]+l[6]-l[0]+l[3]-l[30]+l[37]-l[19]+l[21]+l[25]-l[15]==-42)
s.add(l[21]+l[26]-l[17]-l[25]+l[27]-l[22]-l[39]-l[23]-l[15]-l[20]-l[32]+l[12]+l[3]-l[6]+l[28]+l[31]+l[13]-l[16]-l[37]-l[30]-l[5]+l[41]+l[29]+l[36]+l[1]+l[11]+l[24]+l[18]-l[40]+l[19]-l[35]+l[2]-l[38]+l[14]-l[9]+l[4]+l[0]-l[33]==289)
s.add(l[29]+l[31]+l[32]-l[17]-l[7]+l[34]+l[2]+l[14]+l[23]-l[4]+l[3]+l[35]-l[33]-l[9]-l[20]-l[37]+l[24]-l[27]+l[36]+l[15]-l[18]-l[0]+l[12]+l[11]-l[38]+l[6]+l[22]+l[39]-l[25]-l[10]-l[19]-l[1]+l[13]-l[41]+l[30]-l[16]+l[28]-l[26]==-117)
s.add(l[5]+l[37]-l[39]+l[0]-l[27]+l[12]+l[41]-l[22]+l[8]-l[16]-l[38]+l[9]+l[15]-l[35]-l[29]+l[18]+l[6]-l[25]-l[28]+l[36]+l[34]+l[32]-l[14]-l[1]+l[20]+l[40]-l[19]-l[4]-l[7]+l[26]+l[30]-l[10]+l[13]-l[21]+l[2]-l[23]-l[3]-l[33]==-252)
s.add(l[29]+l[10]-l[41]-l[9]+l[12]-l[28]+l[11]+l[40]-l[27]-l[8]+l[32]-l[25]-l[23]+l[39]-l[1]-l[36]-l[15]+l[33]-l[20]+l[18]+l[22]-l[3]+l[6]-l[34]-l[21]+l[19]+l[26]+l[13]-l[4]+l[7]-l[37]+l[38]-l[2]-l[30]-l[0]-l[35]+l[5]+l[17]==-183)
s.add(l[6]-l[8]-l[20]+l[34]-l[33]-l[25]-l[4]+l[3]+l[17]-l[13]-l[15]-l[40]+l[1]-l[30]-l[14]-l[28]-l[35]+l[38]-l[22]+l[2]+l[24]-l[29]+l[5]+l[9]+l[37]+l[23]-l[18]+l[19]-l[21]+l[11]+l[36]+l[41]-l[7]-l[32]+l[10]+l[26]-l[0]+l[31]==188)
s.add(l[3]+l[6]-l[41]+l[10]+l[39]+l[37]+l[1]+l[8]+l[21]+l[24]+l[29]+l[12]+l[27]-l[38]+l[11]+l[23]+l[28]+l[33]-l[31]+l[14]-l[5]+l[32]-l[17]+l[40]-l[34]+l[20]-l[22]-l[16]+l[19]+l[2]-l[36]-l[7]+l[18]+l[15]+l[26]-l[0]-l[4]+l[35]==1036)
s.add(l[28]-l[33]+l[2]+l[37]-l[12]-l[9]-l[39]+l[16]-l[32]+l[8]-l[36]+l[31]+l[10]-l[4]+l[21]-l[25]+l[18]+l[24]-l[0]+l[29]-l[26]+l[35]-l[22]-l[41]-l[6]+l[15]+l[19]+l[40]+l[7]+l[34]+l[17]-l[3]-l[13]+l[5]+l[23]+l[11]-l[27]+l[1]==328)
s.add(l[22]-l[32]+l[17]-l[9]+l[20]-l[18]-l[34]+l[23]+l[36]-l[35]-l[38]+l[27]+l[4]-l[5]-l[41]+l[29]+l[33]+l[0]-l[37]+l[28]-l[40]-l[11]-l[12]+l[7]+l[1]+l[2]-l[26]-l[16]-l[8]+l[24]-l[25]+l[3]-l[6]-l[19]-l[39]-l[14]-l[31]+l[10]==-196)
s.add(l[11]+l[13]+l[14]-l[15]-l[29]-l[2]+l[7]+l[20]+l[30]-l[36]-l[33]-l[19]+l[31]+l[0]-l[39]-l[4]-l[6]+l[38]+l[35]-l[28]+l[34]-l[9]-l[23]-l[26]+l[37]-l[8]-l[27]+l[5]-l[41]+l[3]+l[17]+l[40]-l[10]+l[25]+l[12]-l[24]+l[18]+l[32]==7)
s.add(l[34]-l[37]-l[40]+l[4]-l[22]-l[31]-l[6]+l[38]+l[13]-l[28]+l[8]+l[30]-l[20]-l[7]-l[32]+l[26]+l[1]-l[18]+l[5]+l[35]-l[24]-l[41]+l[9]-l[0]-l[2]-l[15]-l[10]+l[12]-l[36]+l[33]-l[16]-l[14]-l[25]-l[29]-l[21]+l[27]+l[3]-l[17]==-945)
s.add(l[12]-l[30]-l[8]+l[20]-l[2]-l[36]-l[25]-l[0]-l[19]-l[28]-l[7]-l[11]-l[33]+l[4]-l[23]+l[10]-l[41]+l[39]-l[32]+l[27]+l[18]+l[15]+l[34]+l[13]-l[40]+l[29]-l[6]+l[37]-l[14]-l[16]+l[38]-l[26]+l[17]+l[31]-l[22]-l[35]+l[5]-l[1]==-480)
s.add(l[36]-l[11]-l[34]+l[8]+l[0]+l[15]+l[28]-l[39]-l[32]-l[2]-l[27]+l[22]+l[16]-l[30]-l[3]+l[31]-l[26]+l[20]+l[17]-l[29]-l[18]+l[19]-l[10]+l[6]-l[5]-l[38]-l[25]-l[24]+l[4]+l[23]+l[9]+l[14]+l[21]-l[37]+l[13]-l[41]-l[12]+l[35]==-213)
s.add(l[19]-l[36]-l[12]+l[33]-l[27]-l[37]-l[25]+l[38]+l[16]-l[18]+l[22]-l[39]+l[13]-l[7]-l[31]-l[26]+l[15]-l[10]-l[9]-l[2]-l[30]-l[11]+l[41]-l[4]+l[24]+l[34]+l[5]+l[17]+l[14]+l[6]+l[8]-l[21]-l[23]+l[32]-l[1]-l[29]-l[0]+l[3]==-386)
s.add(l[0]+l[7]-l[28]-l[38]+l[19]+l[31]-l[5]+l[24]-l[3]+l[33]-l[12]-l[29]+l[32]+l[1]-l[34]-l[9]-l[25]+l[26]-l[8]+l[4]-l[10]+l[40]-l[15]-l[11]-l[27]+l[36]+l[14]+l[41]-l[35]-l[13]-l[17]-l[21]-l[18]+l[39]-l[2]+l[20]-l[23]-l[22]==-349)
s.add(l[10]+l[22]+l[21]-l[0]+l[15]-l[6]+l[20]-l[29]-l[30]-l[33]+l[19]+l[23]-l[28]+l[41]-l[27]-l[12]-l[37]-l[32]+l[34]-l[36]+l[3]+l[1]-l[13]+l[18]+l[14]+l[9]+l[7]-l[39]+l[8]+l[2]-l[31]-l[5]-l[40]+l[38]-l[26]-l[4]+l[16]-l[25]==98)
s.add(l[28]+l[38]+l[20]+l[0]-l[5]-l[34]-l[41]+l[22]-l[26]+l[11]+l[29]+l[31]-l[3]-l[16]+l[23]+l[17]-l[18]+l[9]-l[4]-l[12]-l[19]-l[40]-l[27]+l[33]+l[8]-l[37]+l[2]+l[15]-l[24]-l[39]+l[10]+l[35]-l[1]+l[30]-l[36]-l[25]-l[14]-l[32]==-412)
s.add(l[1]-l[24]-l[29]+l[39]+l[41]+l[0]+l[9]-l[19]+l[6]-l[37]-l[22]+l[32]+l[21]+l[28]+l[36]+l[4]-l[17]+l[20]-l[13]-l[35]-l[5]+l[33]-l[27]-l[30]+l[40]+l[25]-l[18]+l[34]-l[3]-l[10]-l[16]-l[23]-l[38]+l[8]-l[14]-l[11]-l[7]+l[12]==-95)
s.add(l[2]-l[24]+l[31]+l[0]+l[9]-l[6]+l[7]-l[1]-l[22]+l[8]-l[23]+l[40]+l[20]-l[38]-l[11]-l[14]+l[18]-l[36]+l[15]-l[4]-l[41]-l[12]-l[34]+l[32]-l[35]+l[17]-l[21]-l[10]-l[29]+l[39]-l[16]+l[27]+l[26]-l[3]-l[5]+l[13]+l[25]-l[28]==-379)
s.add(l[19]-l[17]+l[31]+l[14]+l[6]-l[12]+l[16]-l[8]+l[27]-l[13]+l[41]+l[2]-l[7]+l[32]+l[1]+l[25]-l[9]+l[37]+l[34]-l[18]-l[40]-l[11]-l[10]+l[38]+l[21]+l[3]-l[0]+l[24]+l[15]+l[23]-l[20]+l[26]+l[22]-l[4]-l[28]-l[5]+l[39]+l[35]==861)
s.add(l[35]+l[36]-l[16]-l[26]-l[31]+l[0]+l[21]-l[13]+l[14]+l[39]+l[7]+l[4]+l[34]+l[38]+l[17]+l[22]+l[32]+l[5]+l[15]+l[8]-l[29]+l[40]+l[24]+l[6]+l[30]-l[2]+l[25]+l[23]+l[1]+l[12]+l[9]-l[10]-l[3]-l[19]+l[20]-l[37]-l[33]-l[18]==1169)
s.add(l[13]+l[0]-l[25]-l[32]-l[21]-l[34]-l[14]-l[9]-l[8]-l[15]-l[16]+l[38]-l[35]-l[30]-l[40]-l[12]+l[3]-l[19]+l[4]-l[41]+l[2]-l[36]+l[37]+l[17]-l[1]+l[26]-l[39]-l[10]-l[33]+l[5]-l[27]-l[23]-l[24]-l[7]+l[31]-l[28]-l[18]+l[6]==-1236)
s.add(l[20]+l[27]-l[29]-l[25]-l[3]+l[28]-l[32]-l[11]+l[10]+l[31]+l[16]+l[21]-l[7]+l[4]-l[24]-l[35]+l[26]+l[12]-l[37]+l[6]+l[23]+l[41]-l[39]-l[38]+l[40]-l[36]+l[8]-l[9]-l[5]-l[1]-l[13]-l[14]+l[19]+l[0]-l[34]-l[15]+l[17]+l[22]==-114)
s.add(l[12]-l[28]-l[13]-l[23]-l[33]+l[18]+l[10]+l[11]+l[2]-l[36]+l[41]-l[16]+l[39]+l[34]+l[32]+l[37]-l[38]+l[20]+l[6]+l[7]+l[31]+l[5]+l[22]-l[4]-l[15]-l[24]+l[17]-l[3]+l[1]-l[35]-l[9]+l[30]+l[25]-l[0]-l[8]-l[14]+l[26]+l[21]==659)
s.add(l[21]-l[3]+l[7]-l[27]+l[0]-l[32]-l[24]-l[37]+l[4]-l[22]+l[20]-l[5]-l[30]-l[31]-l[1]+l[15]+l[41]+l[12]+l[40]+l[38]-l[17]-l[39]+l[19]-l[13]+l[23]+l[18]-l[2]+l[6]-l[33]-l[9]+l[28]+l[8]-l[16]-l[10]-l[14]+l[34]+l[35]-l[11]==-430)
s.add(l[11]-l[23]-l[9]-l[19]+l[17]+l[38]-l[36]-l[22]-l[10]+l[27]-l[14]-l[4]+l[5]+l[31]+l[2]+l[0]-l[16]-l[8]-l[28]+l[3]+l[40]+l[25]-l[33]+l[13]-l[32]-l[35]+l[26]-l[20]-l[41]-l[30]-l[12]-l[7]+l[37]-l[39]+l[15]+l[18]-l[29]-l[21]==-513)
s.add(l[32]+l[19]+l[4]-l[13]-l[17]-l[30]+l[5]-l[33]-l[37]-l[15]-l[18]+l[7]+l[25]-l[14]+l[35]+l[40]+l[16]+l[1]+l[2]+l[26]-l[3]-l[39]-l[22]+l[23]-l[36]-l[27]-l[9]+l[6]-l[41]-l[0]-l[31]-l[20]+l[12]-l[8]+l[29]-l[11]-l[34]+l[21]==-502)
s.add(l[30]-l[31]-l[36]+l[3]+l[9]-l[40]-l[33]+l[25]+l[39]-l[26]+l[23]-l[0]-l[29]-l[32]-l[4]+l[37]+l[28]+l[21]+l[17]+l[2]+l[24]+l[6]+l[5]+l[8]+l[16]+l[27]+l[19]+l[12]+l[20]+l[41]-l[22]+l[15]-l[11]+l[34]-l[18]-l[38]+l[1]-l[14]==853)
s.add(l[38]-l[10]+l[16]+l[8]+l[21]-l[25]+l[36]-l[30]+l[31]-l[3]+l[5]-l[15]+l[23]-l[28]+l[7]+l[12]-l[29]+l[22]-l[0]-l[37]-l[14]-l[11]+l[32]+l[33]-l[9]+l[39]+l[41]-l[19]-l[1]+l[18]-l[4]-l[6]+l[13]+l[20]-l[2]-l[35]-l[26]+l[27]==-28)
s.add(l[11]+l[18]-l[26]+l[15]-l[14]-l[33]+l[7]-l[23]-l[25]+l[0]-l[6]-l[21]-l[16]+l[17]-l[19]-l[28]-l[38]-l[37]+l[9]+l[20]-l[8]-l[3]+l[22]-l[35]-l[10]-l[31]-l[2]+l[41]-l[1]-l[4]+l[24]-l[34]+l[39]+l[40]+l[32]-l[5]+l[36]-l[27]==-529)
s.add(l[38]+l[8]+l[36]+l[35]-l[23]-l[34]+l[13]-l[4]-l[27]-l[24]+l[26]+l[31]-l[30]-l[5]-l[40]+l[28]-l[11]-l[2]-l[39]+l[15]+l[10]-l[17]+l[3]+l[19]+l[22]+l[33]+l[0]+l[37]+l[16]-l[9]-l[32]+l[25]-l[21]-l[12]+l[6]-l[41]+l[20]-l[18]==-12)
s.add(l[6]-l[30]-l[20]-l[27]-l[14]-l[39]+l[41]-l[33]-l[0]+l[25]-l[32]-l[3]+l[26]-l[12]+l[8]-l[35]-l[24]+l[15]+l[9]-l[4]+l[13]+l[36]+l[34]+l[1]-l[28]-l[21]+l[18]+l[23]+l[29]-l[10]-l[38]+l[22]+l[37]+l[5]+l[19]+l[7]+l[16]-l[31]==81)

print(s.check())

m = s.model()

for i in range(0x2a):
    print(chr(m[l[i]].as_long() & 0xff), end='')

又摸了一天鱼。