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71 lines
1.4 KiB
JavaScript
71 lines
1.4 KiB
JavaScript
4 years ago
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const { readInput } = require("./util");
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const { lines } = readInput("input");
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class Buffer {
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constructor(size = 25) {
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this.buffer = [];
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this.size = size;
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}
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push(val) {
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this.buffer.push(val);
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if (this.buffer.length > this.size) {
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this.buffer.shift();
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}
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}
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isValid(val) {
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if (this.buffer.length < this.size) {
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return true;
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}
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for (let a = 0; a < this.buffer.length; a++) {
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const wanted = val - this.buffer[a];
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for (let b = a + 1; b < this.buffer.length; b++) {
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if (this.buffer[b] === wanted) {
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return true;
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}
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}
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}
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return false;
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}
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}
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let weakness = null;
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const buffer = new Buffer(25);
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for (const line of lines) {
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const val = parseInt(line);
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// console.log(buffer.buffer, val, buffer.isValid(val));
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if (!buffer.isValid(val)) {
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weakness = val;
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break;
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}
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buffer.push(parseInt(line));
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}
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const stream = lines.map((line) => parseInt(line));
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let lower = 0;
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let upper = 0;
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let sum = stream[0];
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while (sum !== weakness && lower < stream.length) {
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while (sum > weakness) {
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sum -= stream[upper];
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upper--;
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}
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while (sum < weakness) {
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upper++;
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sum += stream[upper];
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}
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sum -= stream[lower];
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lower++;
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}
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const range = stream.slice(lower, upper + 1);
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const [min, max] = [Math.min(...range), Math.max(...range)];
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console.log({ lower, upper, range, min, max });
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console.log("Solution:");
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console.log(min + max);
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