31 lines
1.0 KiB
JavaScript
31 lines
1.0 KiB
JavaScript
#!/usr/bin/env node
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var fs = require('fs');
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var data = fs.readFileSync(process.argv[2],'utf8').split('\n').filter(i=>i).map(i=>i.split(' ').map(i=>parseInt(i)));
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var safety_count = 0;
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function listwithout(list,idx) {
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return list.slice(0,idx).concat(list.slice(idx+1));
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}
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function isreportsafe(report,retry=true) {
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var first = report.slice(0,-1);
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var diffs = first.map((elem,idx)=>report[idx+1]-elem);
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if(diffs[0]<0) { //Is negative
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diffs = diffs.map(i=>-i); //Negate it
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}
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for(var idx=0;idx<diffs.length;++idx) {
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if(diffs[idx]<1 || diffs[idx]>3) {
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//return false; //We need to test removal
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//If an improvement is made then it will be by removing one of the elements associated with this diff
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if(retry) return isreportsafe(listwithout(report,idx-1),false) || isreportsafe(listwithout(report,idx),false) || isreportsafe(listwithout(report,idx+1),false);
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return false;
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}
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}
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return true;
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}
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var safety_count = data.reduce((acc,report)=>acc+(isreportsafe(report)?1:0),0);
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console.log('Result:',safety_count); |