90 lines
1.9 KiB
TypeScript
90 lines
1.9 KiB
TypeScript
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enum LogLevel {
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Answer,
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Info,
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Debug,
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}
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const LOG_LEVEL = LogLevel.Info;
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const print = (level: keyof typeof LogLevel, msg: string) => {
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if (LogLevel[level] <= LOG_LEVEL) {
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console.log(level+': '+msg);
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}
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}
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const file = Bun.file("input.txt");
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const input = await file.text();
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function* findNumbers (schematic: string[]) {
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const matcher = /[0-9]+/g;
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for (const i in schematic) {
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const line = schematic[i];
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for (let res = matcher.exec(line); res !== null; res = matcher.exec(line)) {
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const start = matcher.lastIndex - res[0].length;
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const end = matcher.lastIndex - 1;
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print('Debug',`"${res[0]}" at [${start}-${end}]`);
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yield {
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line: Number(i),
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index: start,
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len: res[0].length,
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num: Number(res[0])
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};
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}
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}
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}
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interface Match {
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line: number,
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index: number,
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len: number,
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num: number,
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}
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function isPartNumber (schematic: string[], match: Match): boolean {
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const width = schematic[0].length - 1;
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const height = schematic.length - 1;
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let surroundings = "";
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const start = Math.max(match.index-1, 0);
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const end = Math.min(match.index + match.len, width);
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if (match.line > 0) {
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surroundings += schematic[match.line - 1].slice(start, end + 1) + " ";
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}
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if (match.index > 0) {
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surroundings += schematic[match.line][start] + " ";
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}
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if (match.index + match.len + 1 < width) {
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surroundings += schematic[match.line][end] + " ";
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}
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if (match.line < height) {
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surroundings += schematic[match.line + 1].slice(start, end + 1) + " ";
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}
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print('Debug', `surroundings: ${surroundings}`)
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return /[^0-9. ]/g.test(surroundings);
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}
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function main(): void {
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const lines = input.trim().split("\n");
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for (const line of lines) {
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print('Info', line);
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}
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const partNumbers = [];
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for (const match of findNumbers(lines)) {
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if (isPartNumber(lines,match)) {
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partNumbers.push(match.num);
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}
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}
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print('Debug', `Part Numbers: ${partNumbers}`)
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print('Answer', `${partNumbers.reduce((a,b)=>a+b)}`)
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}
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main();
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