/in/foo.cc: In function 'int main()':
/in/foo.cc:11:44: error: expected initializer before '+=' token
   11 |                         int x=n[i]+n[j],cnt+=(sqrt(x)*sqrt(x)==x);
      |                                            ^~
/in/foo.cc:11:29: warning: unused variable 'x' [-Wunused-variable]
   11 |                         int x=n[i]+n[j],cnt+=(sqrt(x)*sqrt(x)==x);
      |                             ^