/in/foo.cc: In function 'void solve(long long int, long long int, long long int, long long int)':
/in/foo.cc:84:7: warning: 'pos' may be used uninitialized in this function [-Wmaybe-uninitialized]
  solve(l,mid-1,L,pos); solve(mid+1,r,pos,R);
  ~~~~~^~~~~~~~~~~~~~~