/in/foo.cc: In function 'int main()':
/in/foo.cc:49:8: warning: unused variable 'ma' [-Wunused-variable]
  int p,ma=0,mid,h,t;
        ^~
/in/foo.cc:49:13: warning: unused variable 'mid' [-Wunused-variable]
  int p,ma=0,mid,h,t;
             ^~~