foo.cc: In function 'int main()':
foo.cc:10:35: error: lvalue required as left operand of assignment
    if((i*i-i*j-j*j)*(i*i-i*j-j*j)=1)
                                   ^
foo.cc:17:6: warning: init-statement in selection statements only available with -std=c++1z or -std=gnu++1z
   if(max<(a[i]*a[i]+b[i]*b[i])
      ^~~
foo.cc:18:6: error: expected ';' before 'max'
      max=a[i]*a[i]+b[i]*b[i];
      ^~~
foo.cc:17:9: warning: statement has no effect [-Wunused-value]
   if(max<(a[i]*a[i]+b[i]*b[i])
      ~~~^~~~~~~~~~~~~~~~~~~~~~
foo.cc:19:21: error: expected ')' before ';' token
      cout<<max<<endl;
                     ^
foo.cc:5:9: warning: unused variable 'm' [-Wunused-variable]
     int m,n,k,i,j,p=0,max;
         ^
foo.cc:5:11: warning: unused variable 'n' [-Wunused-variable]
     int m,n,k,i,j,p=0,max;
           ^

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