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// This is the original code posted on IOTA's Discord.
int ref1(int i, int x, int y)
{
return i % y + ((((i / y) + x) % 3) + (i / (y * 3)) * 3) * y;
}
// A simplified version posted by someone on IOTA's Discord (not exactly sure
// who posted it first).
int ref2(int i, int x, int y)
{
return i + (((i / y) + x) % 3 - ((i / y) % 3)) * y;
}
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