/in/foo.cc: In function 'int main()':
/in/foo.cc:24:5: warning: unused variable 't1' [-Wunused-variable]
  LL t1=k-n,t2=m;
     ^~
/in/foo.cc:24:12: warning: unused variable 't2' [-Wunused-variable]
  LL t1=k-n,t2=m;
            ^~