Day 2: Cube Conundrum


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  • Jummit@lemmy.one
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    11 months ago

    Mostly an input parsing problem this time, but it was fun to use Hares tokenizer functions:

    lua
    -- SPDX-FileCopyrightText: 2023 Jummit
    --
    -- SPDX-License-Identifier: GPL-3.0-or-later
    
    local colors = {"blue", "red", "green"}
    local available = {red = 12, blue = 14, green = 13}
    local possible = 0
    local id = 0
    local min = 0
    
    for game in io.open("2.input"):lines() do
      id = id + 1
      game = game:gsub("Game %d+: ", "").."; "
      local max = {red = 0, blue = 0, green = 0}
      for show in game:gmatch(".-; ") do
        for _, color in ipairs(colors) do
          local num = tonumber(show:match("(%d+) "..color))
          if num then
            max[color] = math.max(max[color], num)
          end
        end
      end
      min = min + max.red * max.blue * max.green
      local thisPossible = true
      for _, color in ipairs(colors) do
        if max[color] > available[color] then
          thisPossible = false
          break
        end
      end
      if thisPossible then
        possible = possible + id
      end
    end
    
    print(possible)
    print(min)
    
    hare
    // SPDX-FileCopyrightText: 2023 Jummit
    //
    // SPDX-License-Identifier: GPL-3.0-or-later
    
    use strconv;
    use types;
    use strings;
    use io;
    use bufio;
    use os;
    use fmt;
    
    const available: []uint = [12, 13, 14];
    
    fn color_id(color: str) const uint = {
    	switch (color) {
    	case "red" => return 0;
    	case "green" => return 1;
    	case "blue" => return 2;
    	case => abort();
    	};
    };
    
    export fn main() void = {
    	const file = os::open("2.input")!;
    	defer io::close(file)!;
    	const scan = bufio::newscanner(file, types::SIZE_MAX);
    	let possible: uint = 0;
    	let min: uint = 0;
    
    	for (let id = 1u; true; id += 1) {
    		const line = match(bufio::scan_line(&scan)!) {
    		case io::EOF =>
    			break;
    		case let line: const str =>
    			yield strings::sub(
    					line,
    					strings::index(line, ": ") as size + 2,
    					strings::end);
    		};
    		let max: []uint = [0, 0, 0];
    		let tok = strings::rtokenize(line, "; ");
    		for (true) {
    			const show = match(strings::next_token(&tok)) {
    			case void =>
    				break;
    			case let show: str =>
    				yield show;
    			};
    			const pairs = strings::tokenize(show, ", ");
    			for (true) {
    				const pair: (str, str) = match(strings::next_token(&pairs)) {
    				case void =>
    					break;
    				case let pair: str =>
    					let tok = strings::tokenize(pair, " ");
    					yield (
    						strings::next_token(&tok) as str,
    						strings::next_token(&tok) as str
    					);
    				};
    				let color = color_id(pair.1);
    				let amount = strconv::stou(pair.0)!;
    				if (amount > max[color]) max[color] = amount;
    			};
    		};
    		if (max[0] <= available[0] && max[1] <= available[1] && max[2] <= available[2]) {
    			fmt::printfln("{}", id)!;
    			possible += id;
    		};
    		min += max[0] * max[1] * max[2];
    	};
    	
    	fmt::printfln("{}", possible)!;
    	fmt::printfln("{}", min)!;
    };