/in/foo.cc: In function 'void NTT(int*, int, int)':
/in/foo.cc:32:16: warning: unused variable 'idx' [-Wunused-variable]
  for(int i = 1,idx = 0;i < Len;i <<= 1)
                ^~~
/in/foo.cc: In function 'void find()':
/in/foo.cc:65:12: warning: 'g' may be used uninitialized in this function [-Wmaybe-uninitialized]
  int d = 0,g;
            ^