40 lines
1.4 KiB
JavaScript
40 lines
1.4 KiB
JavaScript
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const fs = require('fs');
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const text = fs.readFileSync("./2019/03/input.txt", "utf-8");
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let lineIns = text.split('\n').map(line => line.split(','))
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let linePoints = [];
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for (let line = 0; line < 2; line++){
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let points = [[0,0]];
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for (let i = 0; i < lineIns[line].length; i++){
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let segment = lineIns[line][i];
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let dist = parseInt(segment.slice(1));
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let axis = ((segment[0] == "R") || (segment[0] == "L")) ? 0 : 1;
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let dir = ((segment[0] == "R") || (segment[0] == "U")) ? 1 : -1;
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let coord = points[i];
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coord[axis] += dir * dist;
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coord.axis = axis;
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points.push(coord.slice());
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}
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linePoints.push(points);
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}
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let closest = Infinity;
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for (let i = 0; i < linePoints[0].length-1; i++) {
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let segment0 = linePoints[0].slice(i, i+2);
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let axis0 = linePoints[0][i].axis;
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segment0.sort((a, b) => a[(axis0+1)%2] - b[(axis0+1)%2]);
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for (let j = 0; j < linePoints[1].length-1; j++) {
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let axis1 = linePoints[1][j].axis;
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if (axis0 == axis1) continue;
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let segment1 = linePoints[1].slice(j, j+2);
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segment1.sort((a, b) => a[(axis1+1)%2] - b[(axis1+1)%2]);
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if (segment0[0][axis0] >= segment1[0][axis0] && segment0[1][axis0] <= segment1[1][axis0] &&
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segment1[0][axis1] >= segment0[0][axis1] && segment1[1][axis1] <= segment0[1][axis1]) {
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let cross = Math.abs(segment0[0][axis0]) + Math.abs(segment1[0][axis1]);
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closest = closest < cross ? closest : cross;
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}
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}
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}
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console.log(closest);
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