/in/foo.cc: In function 'int main()':
/in/foo.cc:67:19: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
          int mid=l+r>>1;
                  ~^~
/in/foo.cc:50:23: warning: variable 'now' set but not used [-Wunused-but-set-variable]
  unsigned m,t,a,b,c,d,now,tl,tn,ds,ml;
                       ^~~
/in/foo.cc:50:27: warning: unused variable 'tl' [-Wunused-variable]
  unsigned m,t,a,b,c,d,now,tl,tn,ds,ml;
                           ^~
/in/foo.cc:50:30: warning: unused variable 'tn' [-Wunused-variable]
  unsigned m,t,a,b,c,d,now,tl,tn,ds,ml;
                              ^~
/in/foo.cc:50:33: warning: unused variable 'ds' [-Wunused-variable]
  unsigned m,t,a,b,c,d,now,tl,tn,ds,ml;
                                 ^~