/in/foo.cc: In function 'long long int solve(char*, long int, long int, long int)':
/in/foo.cc:81:13: warning: unused variable 'a' [-Wunused-variable]
  long i,j,k,a,b,c;
             ^
/in/foo.cc:81:15: warning: unused variable 'b' [-Wunused-variable]
  long i,j,k,a,b,c;
               ^
/in/foo.cc:81:17: warning: unused variable 'c' [-Wunused-variable]
  long i,j,k,a,b,c;
                 ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:125:15: warning: unused variable 'b' [-Wunused-variable]
  long i,j,k,a,b,c,l;
               ^
/in/foo.cc:125:17: warning: unused variable 'c' [-Wunused-variable]
  long i,j,k,a,b,c,l;
                 ^
/in/foo.cc: In function 'long int cmp(long int*, long int*)':
/in/foo.cc:78:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^