35 lines
973 B
TypeScript
35 lines
973 B
TypeScript
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const txt = await Deno.readTextFile("input.txt");
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const lst = txt.split("\r\n").map((x) => x.split(" ")
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.filter((x) => x.length > 0))
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.map(x=> x.map(x => parseInt(x)));
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function isSafeReport(
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arr: number[]
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){
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let isIncreasing = true;
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let isDecreasing = true;
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for(let i = 1; i < arr.length; i++){
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const diff = arr[i] - arr[i - 1];
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if (Math.abs(diff) > 3){
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return false;
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}
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if (diff === 0) {
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// if the difference is 0, the array is neither increasing nor decreasing
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return false;
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}
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if(arr[i] > arr[i - 1]){
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isDecreasing = false;
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} else {
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isIncreasing = false;
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}
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}
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if (isIncreasing || isDecreasing){
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return true;
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}
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// if the array is neither increasing nor decreasing
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return false;
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}
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const safeReports = lst.filter(isSafeReport);
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console.log(safeReports);
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console.log(lst.length,safeReports.length);
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