45 lines
1.2 KiB
TypeScript
45 lines
1.2 KiB
TypeScript
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const input = await Deno.readTextFile("input.txt");
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const lines = input.split("\n").map(x => x.trim()).filter(x => x.length > 0);
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const numbers = lines.map(x => x.split(" ").map(x => parseInt(x)));
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function calcDiff(series: number[]){
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return series.map((x, i) => {
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if (i === series.length - 1){
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return 0;
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}
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return series[i + 1] - x;
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}).slice(0, -1);
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}
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function calcFactor(series: number[]){
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const diffs = [series] as number[][];
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for (let i = 0; i < series.length - 1; i++){
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const diff = calcDiff(diffs[diffs.length - 1]);
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diffs.push(diff);
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if (diff.every(x => x === 0)){
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break;
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}
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}
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return diffs.map(diff => diff[0]);
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}
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function getPrevFactors(factors: number[]){
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const ret = [];
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let cur = 0;
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for (let i = factors.length - 1; i >= 0; i--){
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cur = factors[i] - cur;
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ret.push(cur);
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}
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return ret.reverse();
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}
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console.log(calcFactor([10, 13, 16 , 21, 30, 45]));
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console.log(getPrevFactors(calcFactor([10, 13, 16 , 21, 30, 45])))
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let factorsArr = numbers.map(series => {
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return calcFactor(series);
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});
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factorsArr = factorsArr.map(getPrevFactors);
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console.log(factorsArr.map(x=> x[0]).reduce((a, b) => a + b, 0));
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