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  1. #include <iostream>
  2. using namespace std;
  3. int main()
  4. {
  5.     long long int t,a,b,c,flagb,flagc;
  6.     cin>>t;
  7.     string s;
  8.     while(t--)
  9.     {
  10. 	    a=b=c=flagb=flagc=0;
  11.         cin>>s;
  12.         if(s[0]=='x')
  13.         {
  14.             a=1;
  15.             flagb=3;
  16.             if(s[flagb]=='=')
  17.             {
  18.                 b=c=0;
  19.                 goto solve;
  20.             }
  21.         }
  22.         else
  23.         {
  24.             a=(long long int)(s[0]-'0');
  25.             flagb=5;
  26.             int t1=1;
  27.             while(s[t1]!='*')
  28.             {
  29.                 flagb++;
  30.                 a=a*10+(long long int)(s[t1]-'0');
  31.                 t1++;
  32.             }
  33.             if(s[flagb]=='=')
  34.             {
  35.                 b=c=0;
  36.                 goto solve;
  37.             }
  38.         }
  39.         if(s[flagb]=='+')
  40.         {
  41.             if(s[flagb+1]=='x')
  42.             {
  43.                 b=1;
  44.                 flagc=flagb+2;
  45.                 if(s[flagc]=='=')
  46.                 {
  47.                     c=0;
  48.                     goto solve;
  49.                 }
  50.             }
  51.             else
  52.             {
  53.                 b=(long long int)(s[flagb+1]-'0');
  54.                 flagc=flagb+4;
  55.                 int t1=flagb+2;
  56.                 while(s[t1]!='*')
  57.                 {
  58.                     if(s[t1]=='=')
  59.                     {
  60.                         c=b;
  61.                         b=0;
  62.                         goto solve;
  63.                     }
  64.                     flagc++;
  65.                     b=b*10+(long long int)(s[t1]-'0');
  66.                     t1++;
  67.                 }
  68.                 if(s[flagc]=='=')
  69.                 {
  70.                     c=0;
  71.                     goto solve;
  72.                 }
  73.             }
  74.         }
  75.         if(s[flagb]=='-')
  76.         {
  77.             if(s[flagb+1]=='x')
  78.             {
  79.                 b=-1;
  80.                 flagc=flagb+2;
  81.                 if(s[flagc]=='=')
  82.                 {
  83.                     c=0;
  84.                     goto solve;
  85.                 }
  86.             }
  87.             else
  88.             {
  89.                 b=(long long int)(s[flagb+1]-'0');
  90.                 flagc=flagb+4;
  91.                 int t1=flagb+2;
  92.                 while(s[t1]!='*')
  93.                 {
  94.                     if(s[t1]=='=')
  95.                     {
  96.                         c=-b;
  97.                         b=0;
  98.                         goto solve;
  99.                     }
  100.                     flagc++;
  101.                     b=b*10+(long long int)(s[t1]-'0');
  102.                     t1++;
  103.                 }
  104.                 b=-b;
  105.                 if(s[flagc]=='=')
  106.                 {
  107.                     c=0;
  108.                     goto solve;
  109.                 }
  110.             }
  111.         }
  112.         if(s[flagc]=='+')
  113.         {
  114.             c=(long long int)(s[flagc+1]-'0');
  115.             int t1=flagc+2;
  116.             while(s[t1]!='=')
  117.             {
  118.                 c=c*10+(long long int)(s[t1]-'0');
  119.                 t1++;
  120.             }
  121.         }
  122.         else
  123.         {
  124.             c=(long long int)(s[flagc+1]-'0');
  125.             int t1=flagc+2;
  126.             while(s[t1]!='=')
  127.             {
  128.                 c=c*10+(long long int)(s[t1]-'0');
  129.                 t1++;
  130.             }
  131.             c=-c;
  132.         }
  133.         solve:
  134.         //cout<<a<<" "<<b<<" "<<c<<endl;
  135.         if(b==0&&c==0)
  136.             cout<<"Equal roots."<<endl;
  137.         else if(b==0&&c>0)
  138.             cout<<"Imaginary roots."<<endl;
  139.         else
  140.         {
  141.             b*=b;
  142.             b-=4*a*c;
  143.             if(b<0)
  144.                 cout<<"Imaginary roots."<<endl;
  145.             if(b>0)
  146.                 cout<<"Distinct real roots." <<endl;
  147.             if(b==0)
  148.                 cout<<"Equal roots."<<endl;
  149.         }
  150.     }
  151.     return 0;
  152. }
Success #stdin #stdout 0s 3036KB
comments (?)
stdin
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2
x*x-2*x+1=0
2*x*x+5*x-3=0
stdout
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Equal roots.
Distinct real roots.
https://ideone.com/hcYIv1
language:
C++ (gcc 8.3)
created:
10 years ago
visibility:
secret

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