/in/foo.cc: In function 'int main()':
/in/foo.cc:12:7: warning: statement has no effect [-Wunused-value]
  for(i-0;i<n;i++)
      ~^~
/in/foo.cc:8:16: warning: unused variable 'j' [-Wunused-variable]
  int n,na,nb,i,j,sumA=0,sumB=0,pin=0;
                ^
/in/foo.cc:8:32: warning: unused variable 'pin' [-Wunused-variable]
  int n,na,nb,i,j,sumA=0,sumB=0,pin=0;
                                ^~~