fork download
copy 
  1. import std.stdio : writeln;
  2. import std.algorithm.comparison: min, equal;
  3. import std.algorithm.iteration: sum;
  4. import core.time: MonoTime, Duration;
  5.  
  6.  
  7. auto sum_subranges(T)(T input, uint range)
  8. {
  9.     import std.range : chunks;
  10.     import std.algorithm : map;
  11.  
  12.     if (range != 0)
  13.     {
  14.         return input.chunks(range).map!(sum);
  15.     }
  16.     return typeof(return).init;
  17. }
  18.  
  19. void main()
  20. {
  21.     import std.range : iota, array;
  22.     auto v = iota(0,1000000).array;
  23.     int sum;
  24.     MonoTime beg = MonoTime.currTime;
  25.     for (int i=0; i < 100; i++)
  26.         sum += cast(int)sum_subranges(v,2).length;
  27.     MonoTime end = MonoTime.currTime;
  28.     writeln(end-beg);
  29.     writeln(sum);
  30.  
  31.     assert(equal(sum_subranges([1,1,1], 2), [2, 1]));
  32.     assert(equal(sum_subranges([1,1,1,2,3,3], 2), [2, 3, 6]));
  33.     assert(equal(sum_subranges(cast(int[])[], 2), cast(int[])[]));
  34.     assert(equal(sum_subranges([1], 2), [1]));
  35. }
Success #stdin #stdout 0.02s 17352KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
4 μs and 1 hnsec
50000000
https://ideone.com/muehUw
language:
D (dmd 2.085.0)
created:
7 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!