mirror of
https://github.com/luau-lang/luau.git
synced 2024-12-13 13:30:40 +00:00
ce1800746b
Old style require is now called with `pcall` to support comparing against Lua. New style require is now a third option. Edit: this will be a temporary solution until the 'paths' support in .luaurc is fixed.
90 lines
2.1 KiB
Lua
90 lines
2.1 KiB
Lua
--[[
|
|
The Great Computer Language Shootout
|
|
http://shootout.alioth.debian.org/
|
|
contributed by Isaac Gouy
|
|
]]
|
|
local bench = script and require(script.Parent.bench_support) or pcall(require, "bench_support") or require("../../bench_support")
|
|
|
|
function test()
|
|
|
|
local function fannkuch(n)
|
|
local check = 0;
|
|
local perm = {};
|
|
local perm1 = {};
|
|
local count = {};
|
|
local maxPerm = {};
|
|
local maxFlipsCount = 0;
|
|
local m = n - 1;
|
|
|
|
for i = 1,n do perm1[i] = i - 1; end
|
|
local r = n;
|
|
|
|
while (true) do
|
|
-- write-out the first 30 permutations
|
|
if (check < 30) then
|
|
local s = "";
|
|
for i = 1,n do s = s .. tostring(perm1[i]+1); end
|
|
check = check + 1;
|
|
end
|
|
|
|
while (r ~= 1) do count[r] = r; r = r - 1; end
|
|
|
|
if (not (perm1[1] == 0 or perm1[m + 1] == m)) then
|
|
for i = 1,n do perm[i] = perm1[i]; end
|
|
|
|
local flipsCount = 0;
|
|
local k;
|
|
|
|
k = perm[1]
|
|
|
|
while (not (k == 0)) do
|
|
local k2 = math.floor((k + 1) / 2);
|
|
for i = 0,k2-1 do
|
|
local temp = perm[i + 1];
|
|
perm[i + 1] = perm[k - i + 1];
|
|
perm[k - i + 1] = temp;
|
|
end
|
|
|
|
flipsCount = flipsCount + 1;
|
|
|
|
k = perm[1]
|
|
end
|
|
|
|
if (flipsCount > maxFlipsCount) then
|
|
maxFlipsCount = flipsCount;
|
|
for i = 1,n do maxPerm[i] = perm1[i]; end
|
|
end
|
|
end
|
|
|
|
while (true) do
|
|
if (r == n) then return maxFlipsCount; end
|
|
|
|
local perm0 = perm1[1];
|
|
local i = 0;
|
|
while (i < r) do
|
|
local j = i + 1;
|
|
perm1[i + 1] = perm1[j + 1];
|
|
i = j;
|
|
end
|
|
perm1[r + 1] = perm0;
|
|
|
|
count[r + 1] = count[r + 1] - 1;
|
|
if (count[r + 1] > 0) then break; end
|
|
r = r + 1;
|
|
end
|
|
end
|
|
|
|
return 0
|
|
end
|
|
|
|
local n = 8;
|
|
local ret = fannkuch(n);
|
|
|
|
local expected = 22;
|
|
if (ret ~= expected) then
|
|
assert(false, "ERROR: bad result: expected " .. expected .. " but got " .. ret);
|
|
end
|
|
|
|
end
|
|
|
|
bench.runCode(test, "fannkuch")
|