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userturkey13 sieg/heil  1yr ago (text post) 458 thread views #129718

Advent of Code 2022: Day 8

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Almost got both of them done as 1-liners, I could do it if I remembered how to use Haskell.

var part1 = ((gridString) => {
    return gridString
        .split('\n')
        .map(line => line.split('').map(str => parseInt(str)))
        .map((row, rowIndex, grid) => row
            .map((height, colIndex) => {
                var column = grid.map(row => row[colIndex]);
                return row.slice(0, colIndex).every(v => height > v) 
                    || row.slice(colIndex + 1).reverse().every(v => height > v) 
                    || column.slice(0, rowIndex).every(v => height > v)
                    || column.slice(rowIndex + 1).reverse().every(v => height > v);
            }))
        .flatMap(row => row.filter(cell => cell))
        .reduce((a, v) => a + v, 0);
})(input);

var part2 = ((gridString) => {
    function takeWhile(array, predicate) {
        for (var i = 0, result = []; i < array.length; i++) {
            if (result.push(array[i]), !predicate(array[i])) break;
        }
        return result;
    }
    return gridString
        .split('\n')
        .map(line => line.split('').map(str => parseInt(str)))
        .map((row, rowIndex, grid) => row
            .map((height, colIndex) => {
                var column = grid.map(row => row[colIndex]);
                return takeWhile(row.slice(0, colIndex).reverse(), (v => height > v)).length
                    * takeWhile(row.slice(colIndex + 1), (v => height > v)).length
                    * takeWhile(column.slice(0, rowIndex).reverse(), v => height > v).length
                    * takeWhile(column.slice(rowIndex + 1), v => height > v).length;
            }))
        .flatMap(row => row)
        .sort((a, b) => b - a)[0];
})(input);

console.log(part1, part2);
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now what's the big O of this mess?

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About as big as your mom.

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