/in/foo.cc: In function 'int main()':
/in/foo.cc:6:12: warning: unused variable 'j' [-Wunused-variable]
  int n=0,i,j,k,s=1,ans=1,max=1;
            ^
/in/foo.cc:6:14: warning: unused variable 'k' [-Wunused-variable]
  int n=0,i,j,k,s=1,ans=1,max=1;
              ^