AdventOfCode-2022/day3.chpl

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2022-12-02 23:48:23 -08:00
use Set;
use IO;
const lowercase: [1..26] string = "abcdefghijklmnopqrstuvwxyz".these();
const uppercase: [27..52] string = "abcdefghijklmnopqrstuvwxyz".toUpper().these();
proc letterScore(letter: string): int {
var (isLower, score1) = lowercase.find(letter);
if isLower then return score1;
var (isUpper, score2) = uppercase.find(letter);
if isUpper then return score2;
halt("Should not happen");
}
proc charSet(str: string): set(string) {
return new set(string, str);
}
proc groupScore(group): int {
var inAll = new set(string, lowercase) | new set(string, uppercase);
for chars in charSet(group) {
inAll &= chars;
}
return + reduce letterScore(inAll.these());
}
iter inputLines() {
for line in stdin.lines() do yield line.strip();
}
iter inputLineHalves() {
for line in inputLines() {
yield line[..<line.size/2];
yield line[line.size/2..];
}
}
proc solveByReshaping(it, size) {
const array = it;
const shaped = reshape(array, {1..(array.size / size), 1..size});
var total = 0;
forall i in shaped.dim(0) with (+ reduce total) {
total reduce= groupScore(shaped[i,..]);
}
return total;
}
config const part = 1;
if part == 1 {
writeln(solveByReshaping(inputLineHalves(), 2));
} else if part == 2 {
writeln(solveByReshaping(inputLines(), 3));
}