/in/foo.cc: In function 'int main()':
/in/foo.cc:5:21: warning: unused variable 'a' [-Wunused-variable]
     long long i,j,k,a,b,m,n,tmp,s,t,best;
                     ^
/in/foo.cc:5:23: warning: unused variable 'b' [-Wunused-variable]
     long long i,j,k,a,b,m,n,tmp,s,t,best;
                       ^
/in/foo.cc:5:29: warning: unused variable 'tmp' [-Wunused-variable]
     long long i,j,k,a,b,m,n,tmp,s,t,best;
                             ^~~
/in/foo.cc:5:35: warning: unused variable 't' [-Wunused-variable]
     long long i,j,k,a,b,m,n,tmp,s,t,best;
                                   ^
/in/foo.cc:7:10: warning: unused variable 'x' [-Wunused-variable]
     long x,y;
          ^
/in/foo.cc:7:12: warning: unused variable 'y' [-Wunused-variable]
     long x,y;
            ^