60 lines
1.4 KiB
TypeScript
60 lines
1.4 KiB
TypeScript
namespace AdventOfCode2019_10_1
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{
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const DAY = 10;
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const PROBLEM = 1;
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export async function run()
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{
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let input = await AdventOfCode.getInput(DAY);
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if (input == null) return;
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input = input.trim();
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let data: { [_:number]:[number,number,boolean] } = {};
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const width = input.split(new RegExp('\r?\n'))[0].length;
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const height = input.split(new RegExp('\r?\n')).length;
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let x=0;
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let y=0;
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for(let i=0; i<input.length;i++)
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{
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if (input[i]=="\r") continue;
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if (input[i]=="\n") { x=0;y++; continue; }
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data[y*10000+x] = [x, y, input[i]==="#"];
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x++;
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}
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let ac_max = -1;
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for(let cy=0; cy<height;cy++)
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for(let cx=0; cx<width;cx++)
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{
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if (!data[cy*10000+cx][2]) continue;
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// same [dx,dy]/gcd === hiding each other
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const count = Object.entries(data)
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.filter(p => p[1][2])
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.map(p => [cx-p[1][0], cy-p[1][1]])
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.filter(p => p[0] != 0 || p[1] != 0)
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.map(p => { const div = gcd(p[0], p[1]); return [ p[0]/div, p[1]/div ] })
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.map(p => p[0] * 10000 + p[1])
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.sort((a, b) => a - b).filter((v,i,s) => s.indexOf(v)===i) // unique
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.length;
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AdventOfCode.outputConsole(`${((count>ac_max)?"+":" ")}[${cx}|${cy}] := ${count}`);
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if (count>ac_max) ac_max=count;
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}
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AdventOfCode.output(DAY, PROBLEM, ac_max.toString());
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}
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function gcd(x: number, y: number)
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{
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x = Math.abs(x);
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y = Math.abs(y);
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while(y) { var t = y; y = x % y; x = t; }
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return x;
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}
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}
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