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NoPaste.ml

NoPaste is a client-side paste service which works with no database, and no back-end code

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    2021-08-27

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  • [2017 day 15] "at most 15 seconds on ten-year-old hardware", really?
    And as long as we're complaining about compute-heavy problems, 2016 day 5 is the worst; it took 3 hours and 11 minutes to complete in m4 on my hardware (computing md5 in python involves calling into a library which in turn probably uses pre-compiled C code rather than native python for the core computations, but computing it natively in m4 is just painfully slow). Source: about 3 years ago
  • [2018 day 14][m4] reduced memory solution
    So I coded up something that I did not see mentioned anywhere in the megathread. Instead of storing just the recipe number in each array location, with an array entry for every recipe, I stored a tuple of recipe number and next array position. For a0-a22, the next number is pre-computed. But for a23 onwards, the next array position is exactly one larger - that is, the rest of my array stores ONLY the recipes... Source: about 3 years ago
  • [2018 day 2][m4] optimizing the search for similar words
    So my next round did what many of the megathread solutions did: for each pair of input lines, determine if they are similar. This cuts the complexity from exponential O(2^n) to quadratic O(n^2), and runtime was down to 1.3s (a 300x speedup over regex abuse). Note that due to the use of substr, I risk inadvertent macro expansion if slicing a lower-case line forms a macro name such as 'nl', so I had to further... Source: over 3 years ago
  • [2015 day 10][m4] optimizing by matrix multiplication
    Wow, that really made a difference! I got another ~250x speedup (best-case run from ~18.5s to 71ms) with this tweak. Instead of performing a full matrix multiply (O(1) work per iteration regardless of active rows, and O(log n) iterations), I take advantage of the sparseness of the initial few iterations. That is, I start out with only one row active; (however, by iteration 50 all 92 rows are active), as well as... Source: over 3 years ago
  • [2017 day 15][m4] solution using signed 32-bit math and no division
    Or course, only after I had written my entire solution did I notice in the megathread that avoiding division when computing math modulo M31 (0x7fffffff) is already a known optimization. But I thought it was pretty cool that I was able to derive that optimization from something more general, and that my solution works without any 64-bit math or explicit division operators. Source: over 3 years ago
  • [2015 day 6][m4] reducing the amount of work with sweep lines
    But while that was still fairly easy to write (and more compact in m4 than in the pseudocode), I was annoyed that it had O(n) behavior. Since the list of known ranges is sorted, we should be able to perform O(log n) lookup/insertion on that list. With m4, this is painful: it's easy to access the front of a list or stack, but random access to the middle requires implementing some other data structure on top, and... Source: over 3 years ago
  • [2015 day 10][m4] optimizing by matrix multiplication
    With that done, my updated code now executes in 18s (a 6x speedup), and more importantly, I can pick other limits (such as 60) with the change in timing related ONLY to how many matrix multiplications are required to reach that limit (and only insofar as I don't overflow m4's signed 32-bit math limits), no additional memory due to string expansion is required (my character comparisons were limited to the initial... Source: over 3 years ago

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