YuriGor

pub const ARR: &[&[i32]] = &[
&[0],
&[0,1],
&[0,1,2],
&[0,1,2,3],
//&[...........],
&[0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,101,102,103,104,105,106,107,108,109,110,111,112,113,114,115,116,117,118,119,120,121,122,123,124,125,126,127,128,129,130,131,132,133,134,135,136,137,138,139,140,141,142,143,144,145,146,147,148,149,150,151,152,153,154,155,156,157,158,159,160,161,162,163,164,165,166,167,168,169,170,171,172,173,174,175,176,177,178,179,180,181,182,183,184,185,186,187,188,189,190,191,192,193,194,195,196,197,198,199,200,201,202,203,204,205,206,207,208,209,210,211,212,213,214,215,216,217,218,219,220,221,222,223,224,225,226,227,228,229,230,231,232,233,234,235,236,237,238,239,240,241,242,243,244,245,246,247,248,249,250,251,252,253,254,255,256,257,258,259,260,261,

YuriGor

// https://users.rust-lang.org/t/memory-friendly-2d-array-with-variable-length-rows/99330

pub struct VariableRowArray<T, const SIZE: usize, const ROWS: usize> {
    data: [T; SIZE],      // The main data array where rows are stored.
    index: [usize; ROWS], // An index array to track the start of each row in the data array.
    num_rows: usize,      // The current number of rows in the array.
}

impl<T: Default + std::marker::Copy, const SIZE: usize, const ROWS: usize>
    VariableRowArray<T, SIZE, ROWS>