adventOfCode2023

Parsing input in Chapel

Day 1

Just using readLine.

7jlncfksix7rjgrpglmn9

Day 2

Uses lots of split calls on strings. Also using an iterator to read into a 1D array of strings.

Game 1: 3 blue, 4 red; 1 red, 2 green, 6 blue; 2 green

Day 3

Reading in a 1D array of strings.

const Schematic = readLines();
iter readLines() {
  for line in stdin.lines() {
    yield line.strip();
  }
}

Will use later

Reading in a 1D array of strings that can treat like a 2D array.

// Read in schematic as a 2D array of characters by
// converting a 1D array of strings into that 2D array.
const Lines = readLines();
const numRows = Lines.size,
      numCols = Lines[0].size,
      SchematicDomain = {0..<numRows, 0..<numCols};

var Schematic = [(r,c) in SchematicDomain] Lines[r][c];

iter readLines() {
  for line in stdin.lines() {
    yield line.strip();
  }
}

Sample input

467..114..
...*......
..35..633.
......#...
617*......
.....+.58.
..592.....
......755.
...$.*....
.664.598..

Things that were difficult to find or understand

• An example of how to create map values.

  var digitVals : map(string,int);
  digitVals["one"] = 1;
  digitVals["two"] = 2;
  digitVals["three"] = 3;
  digitVals["four"] = 4;
  digitVals["five"] = 5;
  digitVals["six"] = 6;
  digitVals["seven"] = 7;
  digitVals["eight"] = 8;
  digitVals["nine"] = 9;

• slices documentation at https://chapel-lang.org/docs/primers/slices.html#primers-slices is confusing