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day21.c3
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import std::io, std::time, std::collections, std::math;
fn void! main()
{
@pool() {
Clock c = clock::now();
io::printfn("- Part1: %d - %s", solve(&part1)!, c.mark());
io::printfn("- Part2: %d - %s", solve(&part2)!, c.mark());
};
}
def Calc = fn long(long[<NUMS*NUMS>]);
fn long! solve(Calc calc)
{
String input = (String) file::load_temp("input")!;
long[<NUMS * NUMS>] counts = 0;
foreach(line : input.trim().tsplit("\n")) {
int num = line.trim()[..^2].to_int()!;
List(<int>) chars;
chars.push(encode('A'));
foreach(c: line.trim()) {
chars.push(encode(c));
}
for(long i; i < chars.len()-1; i++) {
int a = chars[i];
int b = chars[i+1];
counts[a * NUMS + b] += num;
}
}
return calc(counts);
}
fn long part1(long[<NUMS*NUMS>] counts) => (counts*LUT3).sum();
fn long part2(long[<NUMS*NUMS>] counts) => (counts*LUT26).sum();
fn int encode(char c) => c % 16 + (c / 64) * 9;
const long NUMS = 11; // [0-9,A]
// every pre-calculated paths on the directional keypad
const long[<NUMS*NUMS>] LUT3 = {
1, 25, 12, 19, 26, 13, 20, 27, 14, 21, 10, 21, 1, 10, 11, 12, 19, 20, 13, 20, 21, 22, 16, 18,
1, 10, 21, 12, 19, 22, 13, 20, 17, 21, 19, 18, 1, 22, 21, 12, 23, 22, 13, 16, 22, 16, 17, 18,
1, 10, 11, 12, 19, 20, 23, 17, 21, 16, 17, 18, 1, 10, 21, 12, 19, 18, 22, 22, 21, 16, 19, 18,
1, 22, 21, 12, 17, 23, 17, 18, 19, 16, 17, 18, 1, 10, 11, 24, 18, 22, 17, 18, 21, 16, 17, 18,
1, 10, 19, 23, 23, 22, 17, 22, 21, 16, 19, 18, 1, 18, 18, 26, 21, 12, 27, 22, 13, 28, 23, 14,
1,
};
// every pre-calculated paths on the numeric keypad
const long[<NUMS*NUMS>] LUT26 = {
1,
31420065369,
14752615084,
24095973437,
31420065370,
14752615085,
24095973438,
31420065371,
14752615086,
24095973439,
14287938116,
27052881363,
1,
14287938116,
14287938117,
14752615084,
24095973437,
24095973438,
14752615085,
24095973438,
24095973439,
27052881364,
20790420654,
22411052532,
1,
14287938116,
28154654777,
14752615084,
24095973437,
28154654778,
14752615085,
24095973438,
22778092491,
27622800565,
22411052533,
22411052532,
1,
28154654778,
28154654777,
14752615084,
28154654779,
28154654778,
14752615085,
20790420654,
27052881364,
20790420654,
22778092491,
22778092492,
1,
14287938116,
14287938117,
14752615084,
24095973437,
24095973438,
27052881365,
20790420655,
27622800565,
20790420654,
22778092491,
22411052532,
1,
14287938116,
28154654777,
14752615084,
24095973437,
22778092492,
27622800566,
27622800566,
27622800565,
20790420654,
22411052533,
22411052532,
1,
28154654778,
28154654777,
14752615084,
20790420655,
27052881365,
20790420655,
22778092492,
22778092493,
20790420654,
22778092491,
22778092492,
1,
14287938116,
14287938117,
27052881366,
20790420656,
27622800566,
20790420655,
22778092492,
27622800565,
20790420654,
22778092491,
22411052532,
1,
14287938116,
22778092493,
27622800567,
27622800567,
27622800566,
20790420655,
27622800566,
27622800565,
20790420654,
22411052533,
22411052532,
1,
20790420656,
22411052532,
31420065370,
28154654777,
14752615084,
31420065371,
28154654778,
14752615085,
31420065372,
28154654779,
14752615086,
1,
};