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b.ts
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b.ts
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import { assertEquals } from "https://deno.land/[email protected]/testing/asserts.ts";
function solution(input: string) {
const check = (
matrix: number[][],
y: number,
x: number,
dx: number,
dy: number,
) => {
const target = matrix[y][x];
let s = 0;
while (true) {
if (
y === matrix.length - 1 ||
x === matrix[y].length - 1 ||
y === 0 ||
x === 0
) {
break;
}
if (target <= matrix[y + dy][x + dx]) {
s++;
break;
} else {
s++;
}
x += dx;
y += dy;
}
return s;
};
const lines = input.split("\n").map((line) =>
line.split("").map((n) => Number(n))
);
const scenicScores: number[] = [];
for (let i = 0; i < lines.length; i++) {
const line = lines[i];
for (let j = 0; j < line.length; j++) {
if (
j === 0 || j === line.length - 1 || i === 0 || i === lines.length - 1
) {
continue;
}
const score = check(lines, i, j, -1, 0) *
check(lines, i, j, 0, -1) *
check(lines, i, j, 1, 0) *
check(lines, i, j, 0, 1);
scenicScores.push(score);
}
}
return Math.max(...scenicScores);
}
Deno.test("example", () => {
const input = Deno.readTextFileSync("./08/example.txt");
const actual = solution(input);
const expected = 8;
assertEquals(actual, expected);
});
Deno.test("puzzle input", { ignore: false }, () => {
const input = Deno.readTextFileSync("./08/input.txt");
const actual = solution(input);
const expected = 211680;
assertEquals(actual, expected);
});