Add 2024/day2/part1.js

2024/day2/part1.js

@@ -0,0 +1,20 @@
+#!/usr/bin/env node
+
+var fs = require('fs');
+var data = fs.readFileSync(process.argv[2],'utf8').split('\n').filter(i=>i).map(i=>i.split(' ').map(i=>parseInt(i)));
+
+var safety_count = 0;
+
+
+function isreportsafe(report) {
+ var first = report.slice(0,-1);
+ var diffs = first.map((elem,idx)=>report[idx+1]-elem);
+ if(diffs[0]<0) { //Is negative
+  diffs = diffs.map(i=>-i); //Negate it
+ }
+ return !diffs.some(i=>(i<1 || i>3));
+}
+
+var safety_count = data.reduce((acc,report)=>acc+(isreportsafe(report)?1:0),0);
+
+console.log('Result:',safety_count);