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  1. or download this
    sub divide {
  my $mid = @_/2;
...
  divide(1 .. $_);
  printf "%2d  %2d\n", $_, $ITER;
}
  2. or download this
    T(1) = 1
T(2) = 1 + 2*T(1)
T(4) = 1 + 2*T(2)
    ...
T(N) = 1 + 2*T(N/2)
  3. or download this
    T(N) = 1 + 2*T(N/2)
     = 1 + 2*(1 + 2*T(N/4))
...
     = 7 + 8*(1 + 2*T(N/16))
     = 7 + 8 + 16*T(N/16)
-->  = 15 + 16*T(N/16)
  4. or download this
    T(N) = 2^k - 1 + 2^k * T(N / 2^k)
     = 2^(log N) - 1 + 2^(log N) * T(N / 2^log(N))
     = N - 1 + N * T(N/N)
     = N - 1 + N * 1
     = 2*N - 1