BUUCTF--equation

2023-11-05 17:10
文章标签 buuctf equation

本文主要是介绍BUUCTF--equation,希望对大家解决编程问题提供一定的参考价值,需要的开发者们随着小编来一起学习吧!

测试文件:https://www.lanzous.com/ib50p4f

 

代码分析

在题目中已经提到了对代码进行Fuck混淆,因此对于if中的代码,我们只需要解码,让flag满足要求即可。

 

第一种解法

http://codertab.com/JsUnFuck

可以到这个网站,将混淆的代码一部分一部分的解,不过过程很繁琐...

 

第二种解法

使用脚本解码

<script>
function deEquation(str) {for (let i = 0; i <= 1; i++) {str = str.replace(/l\[(\D*?)](\+l|-l|==)/g, (m, a, b) => 'l[' + eval(a) + ']' + b);}str = str.replace(/==(\D*?)&&/g, (m, a) => '==' + eval(a) + '&&');return str;
}
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ss=deEquation(s);
document.write(ss);
</script>

最后有一个常量没解,放到上面网站解出81

 

将上面等式整理使用solve或者z3解方程即可

 

脚本

Python

# -*- coding:utf-8 -*-from z3 import *l = [Int("l%d"%i) for i in range(0x2a)]s = Solver()
for i in l:s.add(i>0)s.add(i<255)
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)if s.check() == sat:m = s.model()for i in range(0x2a):print (chr(int("%s"%(m[l[i]]))),end="")

 

MATLAB

syms l0 l1 l2 l3 l4 l5 l6 l7 l8 l9 l10 l11 l12 l13 l14 l15 l16 l17 l18 l19 l20 l21 l22 l23 l24 l25 l26 l27 l28 l29 l30 l31 l32 l33 l34 l35 l36 l37 l38 l39 l40 l41 l42
[l1,l2,l3,l4,l5,l6,l7,l8,l9,l10,l11,l12,l13,l14,l15,l16,l17,l18,l19,l20,l21,l22,l23,l24,l25,l26,l27,l28,l29,l30,l31,l32,l33,l34,l35,l36,l37,l38,l39,l40,l41,l42] = solve(l40+l35+l34-l0-l15-l37+l7+l6-l26+l20+l19+l8-l17-l14-l38+l1-l9+l22+l41+l3-l29-l36-l25+l5+l32-l16+l12-l24+l30+l39+l10+l2+l27+l28+l21+l33-l18+l4==861,...
l31+l26+l11-l33+l27-l3+l12+l30+l1+l32-l16+l7+l10-l25+l38-l41-l14-l19+l29+l36-l9-l28-l6-l0-l22-l18+l20-l37+l4-l24+l34-l21-l39-l23-l8-l40+l15-l35==-448,...
l26+l14+l15+l9+l13+l30-l11+l18+l23+l7+l3+l12+l25-l24-l39-l35-l20+l40-l8+l10-l5-l33-l31+l32+l19+l21-l6+l1+l16+l17+l29+l22-l4-l36+l41+l38+l2+l0==1244,...
l5+l22+l15+l2-l28-l10-l3-l13-l18+l30-l9+l32+l19+l34+l23-l17+l16-l7+l24-l39+l8-l12-l40-l25+l37-l35+l11-l14+l20-l27+l4-l33-l21+l31-l6+l1+l38-l29==-39,...
l41-l29+l23-l4+l20-l33+l35+l3-l19-l21+l11+l26-l24-l17+l37+l1+l16-l0-l13+l7+l10+l14+l22+l39-l40+l34-l38+l32+l25-l2+l15+l6+l28-l8-l5-l31-l30-l27==485,...
l13+l19+l21-l2-l33-l0+l39+l31-l23-l41+l38-l29+l36+l24-l20-l9-l32+l37-l35+l40+l7-l26+l15-l10-l6-l16-l4-l5-l30-l14-l22-l25-l34-l17-l11-l27+l1-l28==-1068,...
l32+l0+l9+l14+l11+l18-l13+l24-l2-l15+l19-l21+l1+l39-l8-l3+l33+l6-l5-l35-l28+l25-l41+l22-l17+l10+l40+l34+l27-l20+l23+l31-l16+l7+l12-l30+l29-l4==939,...
l19+l11+l20-l16+l40+l25+l1-l31+l28-l23+l14-l9-l27+l35+l39-l37-l8-l22+l5-l6+l0-l32+l24+l33+l29+l38+l15-l2+l30+l7+l12-l3-l17+l34+l41-l4-l13-l26==413,...
l22+l4-l9+l34+l35+l17+l3-l24+l38-l5-l41-l31-l0-l25+l33+l15-l1-l10+l16-l29-l12+l26-l39-l21-l18-l6-l40-l13+l8+l37+l19+l14+l32+l28-l11+l23+l36+l7==117,...
l32+l16+l3+l11+l34-l31+l14+l25+l1-l30-l33-l40-l4-l29+l18-l27+l13-l19-l12+l23-l39-l41-l8+l22-l5-l38-l9-l37+l17-l36+l24-l21+l2-l26+l20-l7+l35-l0==-313,...
l40-l1+l5+l7+l33+l29+l12+l38-l31+l2+l14-l35-l8-l24-l39-l9-l28+l23-l17-l22-l26+l32-l11+l4-l36+l10+l20-l18-l16+l6-l0+l3-l30+l37-l19+l21+l25-l15==-42,...
l21+l26-l17-l25+l27-l22-l39-l23-l15-l20-l32+l12+l3-l6+l28+l31+l13-l16-l37-l30-l5+l41+l29+l36+l1+l11+l24+l18-l40+l19-l35+l2-l38+l14-l9+l4+l0-l33==289,...
l29+l31+l32-l17-l7+l34+l2+l14+l23-l4+l3+l35-l33-l9-l20-l37+l24-l27+l36+l15-l18-l0+l12+l11-l38+l6+l22+l39-l25-l10-l19-l1+l13-l41+l30-l16+l28-l26==-117,...
l5+l37-l39+l0-l27+l12+l41-l22+l8-l16-l38+l9+l15-l35-l29+l18+l6-l25-l28+l36+l34+l32-l14-l1+l20+l40-l19-l4-l7+l26+l30-l10+l13-l21+l2-l23-l3-l33==-252,...
l29+l10-l41-l9+l12-l28+l11+l40-l27-l8+l32-l25-l23+l39-l1-l36-l15+l33-l20+l18+l22-l3+l6-l34-l21+l19+l26+l13-l4+l7-l37+l38-l2-l30-l0-l35+l5+l17==-183,...
l6-l8-l20+l34-l33-l25-l4+l3+l17-l13-l15-l40+l1-l30-l14-l28-l35+l38-l22+l2+l24-l29+l5+l9+l37+l23-l18+l19-l21+l11+l36+l41-l7-l32+l10+l26-l0+l31==188,...
l3+l6-l41+l10+l39+l37+l1+l8+l21+l24+l29+l12+l27-l38+l11+l23+l28+l33-l31+l14-l5+l32-l17+l40-l34+l20-l22-l16+l19+l2-l36-l7+l18+l15+l26-l0-l4+l35==1036,...
l28-l33+l2+l37-l12-l9-l39+l16-l32+l8-l36+l31+l10-l4+l21-l25+l18+l24-l0+l29-l26+l35-l22-l41-l6+l15+l19+l40+l7+l34+l17-l3-l13+l5+l23+l11-l27+l1==328,...
l22-l32+l17-l9+l20-l18-l34+l23+l36-l35-l38+l27+l4-l5-l41+l29+l33+l0-l37+l28-l40-l11-l12+l7+l1+l2-l26-l16-l8+l24-l25+l3-l6-l19-l39-l14-l31+l10==-196,...
l11+l13+l14-l15-l29-l2+l7+l20+l30-l36-l33-l19+l31+l0-l39-l4-l6+l38+l35-l28+l34-l9-l23-l26+l37-l8-l27+l5-l41+l3+l17+l40-l10+l25+l12-l24+l18+l32==7,...
l34-l37-l40+l4-l22-l31-l6+l38+l13-l28+l8+l30-l20-l7-l32+l26+l1-l18+l5+l35-l24-l41+l9-l0-l2-l15-l10+l12-l36+l33-l16-l14-l25-l29-l21+l27+l3-l17==-945,...
l12-l30-l8+l20-l2-l36-l25-l0-l19-l28-l7-l11-l33+l4-l23+l10-l41+l39-l32+l27+l18+l15+l34+l13-l40+l29-l6+l37-l14-l16+l38-l26+l17+l31-l22-l35+l5-l1==-480,...
l36-l11-l34+l8+l0+l15+l28-l39-l32-l2-l27+l22+l16-l30-l3+l31-l26+l20+l17-l29-l18+l19-l10+l6-l5-l38-l25-l24+l4+l23+l9+l14+l21-l37+l13-l41-l12+l35==-213,...
l19-l36-l12+l33-l27-l37-l25+l38+l16-l18+l22-l39+l13-l7-l31-l26+l15-l10-l9-l2-l30-l11+l41-l4+l24+l34+l5+l17+l14+l6+l8-l21-l23+l32-l1-l29-l0+l3==-386,...
l0+l7-l28-l38+l19+l31-l5+l24-l3+l33-l12-l29+l32+l1-l34-l9-l25+l26-l8+l4-l10+l40-l15-l11-l27+l36+l14+l41-l35-l13-l17-l21-l18+l39-l2+l20-l23-l22==-349,...
l10+l22+l21-l0+l15-l6+l20-l29-l30-l33+l19+l23-l28+l41-l27-l12-l37-l32+l34-l36+l3+l1-l13+l18+l14+l9+l7-l39+l8+l2-l31-l5-l40+l38-l26-l4+l16-l25==98,...
l28+l38+l20+l0-l5-l34-l41+l22-l26+l11+l29+l31-l3-l16+l23+l17-l18+l9-l4-l12-l19-l40-l27+l33+l8-l37+l2+l15-l24-l39+l10+l35-l1+l30-l36-l25-l14-l32==-412,...
l1-l24-l29+l39+l41+l0+l9-l19+l6-l37-l22+l32+l21+l28+l36+l4-l17+l20-l13-l35-l5+l33-l27-l30+l40+l25-l18+l34-l3-l10-l16-l23-l38+l8-l14-l11-l7+l12==-95,...
l2-l24+l31+l0+l9-l6+l7-l1-l22+l8-l23+l40+l20-l38-l11-l14+l18-l36+l15-l4-l41-l12-l34+l32-l35+l17-l21-l10-l29+l39-l16+l27+l26-l3-l5+l13+l25-l28==-379,...
l19-l17+l31+l14+l6-l12+l16-l8+l27-l13+l41+l2-l7+l32+l1+l25-l9+l37+l34-l18-l40-l11-l10+l38+l21+l3-l0+l24+l15+l23-l20+l26+l22-l4-l28-l5+l39+l35==861,...
l35+l36-l16-l26-l31+l0+l21-l13+l14+l39+l7+l4+l34+l38+l17+l22+l32+l5+l15+l8-l29+l40+l24+l6+l30-l2+l25+l23+l1+l12+l9-l10-l3-l19+l20-l37-l33-l18==1169,...
l13+l0-l25-l32-l21-l34-l14-l9-l8-l15-l16+l38-l35-l30-l40-l12+l3-l19+l4-l41+l2-l36+l37+l17-l1+l26-l39-l10-l33+l5-l27-l23-l24-l7+l31-l28-l18+l6==-1236,...
l20+l27-l29-l25-l3+l28-l32-l11+l10+l31+l16+l21-l7+l4-l24-l35+l26+l12-l37+l6+l23+l41-l39-l38+l40-l36+l8-l9-l5-l1-l13-l14+l19+l0-l34-l15+l17+l22==-114,...
l12-l28-l13-l23-l33+l18+l10+l11+l2-l36+l41-l16+l39+l34+l32+l37-l38+l20+l6+l7+l31+l5+l22-l4-l15-l24+l17-l3+l1-l35-l9+l30+l25-l0-l8-l14+l26+l21==659,...
l21-l3+l7-l27+l0-l32-l24-l37+l4-l22+l20-l5-l30-l31-l1+l15+l41+l12+l40+l38-l17-l39+l19-l13+l23+l18-l2+l6-l33-l9+l28+l8-l16-l10-l14+l34+l35-l11==-430,...
l11-l23-l9-l19+l17+l38-l36-l22-l10+l27-l14-l4+l5+l31+l2+l0-l16-l8-l28+l3+l40+l25-l33+l13-l32-l35+l26-l20-l41-l30-l12-l7+l37-l39+l15+l18-l29-l21==-513,...
l32+l19+l4-l13-l17-l30+l5-l33-l37-l15-l18+l7+l25-l14+l35+l40+l16+l1+l2+l26-l3-l39-l22+l23-l36-l27-l9+l6-l41-l0-l31-l20+l12-l8+l29-l11-l34+l21==-502,...
l30-l31-l36+l3+l9-l40-l33+l25+l39-l26+l23-l0-l29-l32-l4+l37+l28+l21+l17+l2+l24+l6+l5+l8+l16+l27+l19+l12+l20+l41-l22+l15-l11+l34-l18-l38+l1-l14==853,...
l38-l10+l16+l8+l21-l25+l36-l30+l31-l3+l5-l15+l23-l28+l7+l12-l29+l22-l0-l37-l14-l11+l32+l33-l9+l39+l41-l19-l1+l18-l4-l6+l13+l20-l2-l35-l26+l27==-28,...
l11+l18-l26+l15-l14-l33+l7-l23-l25+l0-l6-l21-l16+l17-l19-l28-l38-l37+l9+l20-l8-l3+l22-l35-l10-l31-l2+l41-l1-l4+l24-l34+l39+l40+l32-l5+l36-l27==-529,...
l38+l8+l36+l35-l23-l34+l13-l4-l27-l24+l26+l31-l30-l5-l40+l28-l11-l2-l39+l15+l10-l17+l3+l19+l22+l33+l0+l37+l16-l9-l32+l25-l21-l12+l6-l41+l20-l18==-12,...
l6-l30-l20-l27-l14-l39+l41-l33-l0+l25-l32-l3+l26-l12+l8-l35-l24+l15+l9-l4+l13+l36+l34+l1-l28-l21+l18+l23+l29-l10-l38+l22+l37+l5+l19+l7+l16-l31 == 81)

解出将整型转为字符型就行

 

get flag!

flag{A_l0ng_10NG_eqU4Ti0n_1s_E4Sy_W1Th_z3}

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