60 lines
1.5 KiB
JavaScript
60 lines
1.5 KiB
JavaScript
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var input = require("fs").readFileSync("input.txt").toString().split("\n").filter(a=>a);
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var timeline = [];
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var events = input.sort((a,b)=>{
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var pa = a.match(/\[(\d+-\d+-\d+ (\d+):(\d+))\] (.*)/);
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var pb = b.match(/\[(\d+-\d+-\d+ (\d+):(\d+))\] (.*)/);
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return new Date(pa[1]).getTime() - new Date(pb[1]).getTime();
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})
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console.log(events);
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var guards = [];
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var lastGuard = -1;
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for(var event of events){
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var p = event.match(/\[(\d+-\d+-\d+ (\d+):(\d+))\] (.*)/);
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var time = (parseInt(p[2])*60) + parseInt(p[3])
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if(p[4].includes("begins shift")){
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lastGuard = parseInt(p[4].match(/\#(\d+)/)[1]);
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}
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else{
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if(!guards[lastGuard]){
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guards[lastGuard] = [];
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}
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guards[lastGuard].push(time);
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}
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}
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var guardLengths = guards.map(g=>{
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var total = 0;
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for(var i = 0; i < g.length; i+=2){
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if(g[i+1]<g[i]){
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total += 60*12;
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}
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total += g[i+1] - g[i];
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}
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return total;
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});
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console.log(guards);
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console.log(guardLengths);
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var max = Math.max.apply(null, guardLengths.filter(a=>a));
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var bestGuard = guardLengths.indexOf(max);
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console.log(bestGuard, guards[bestGuard]);
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var mins = [];
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var times = guards[bestGuard];
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for(var i = 0; i < times.length; i+=2){
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for(var t = times[i]; t != times[i+1]; t=(t+1)%(24*60)){
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console.log(t);
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if(!mins[t]){
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mins[t] = 0;
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}
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mins[t]++;
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}
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}
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console.log(mins);
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var bestMin = mins.indexOf(Math.max.apply(null, mins.filter(a=>a)))
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console.log(Math.max.apply(null, mins.filter(a=>a)))
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console.log(bestMin);
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console.log(bestMin * bestGuard);
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