JavaScript
// let input=['on x=10..12,y=10..12,z=10..12','on x=11..13,y=11..13,z=11..13','off x=9..11,y=9..11,z=9..11','on x=10..10,y=10..10,z=10..10',]
let input=['on x=-20..26,y=-36..17,z=-47..7','on x=-20..33,y=-21..23,z=-26..28','on x=-22..28,y=-29..23,z=-38..16','on x=-46..7,y=-6..46,z=-50..-1','on x=-49..1,y=-3..46,z=-24..28','on x=2..47,y=-22..22,z=-23..27','on x=-27..23,y=-28..26,z=-21..29','on x=-39..5,y=-6..47,z=-3..44','on x=-30..21,y=-8..43,z=-13..34','on x=-22..26,y=-27..20,z=-29..19','off x=-48..-32,y=26..41,z=-47..-37','on x=-12..35,y=6..50,z=-50..-2','off x=-48..-32,y=-32..-16,z=-15..-5','on x=-18..26,y=-33..15,z=-7..46','off x=-40..-22,y=-38..-28,z=23..41','on x=-16..35,y=-41..10,z=-47..6','off x=-32..-23,y=11..30,z=-14..3','on x=-49..-5,y=-3..45,z=-29..18','off x=18..30,y=-20..-8,z=-3..13','on x=-41..9,y=-7..43,z=-33..15','on x=-54112..-39298,y=-85059..-49293,z=-27449..7877','on x=967..23432,y=45373..81175,z=27513..53682',]
//let input=[]
let boundX=[null,null],boundY=[null,null],boundZ=[null,null]
let proc=input.map(step=>{
let temp=step.split(',')
temp=temp.map(pos=>{
let t=pos.indexOf('=')
pos=pos.slice(t+1)
return pos.split('..').map(p=>parseInt(p))
})
if(temp[0][0]<boundX[0] || !boundX[0]){
boundX[0]=temp[0][0]
}
if(temp[0][1]+1>boundX[1] || !boundX[1]){
boundX[1]=temp[0][1]+1
}
if(temp[1][0]<boundY[0] || !boundY[0]){
boundY[0]=temp[1][0]
}
if(temp[1][1]+1>boundY[1] || !boundY[1]){
boundY[1]=temp[1][1]+1
}
if(temp[2][0]<boundZ[0] || !boundZ[0]){
boundZ[0]=temp[2][0]
}
if(temp[2][1]+1>boundZ[1] || !boundZ[1]){
boundZ[1]=temp[2][1]+1
}
// console.log(temp)
return [step.slice(0,2),temp]
})
console.log(boundX,boundY,boundZ)
let reactor=new Set()
// let reactor=new Array(Math.abs(boundX[0]-boundX[1]))
// for(let x=0;x<reactor.length;x++){
// reactor[x] =new Array(Math.abs(boundY[0]-boundY[1]))
// for(let y=0;y<reactor[x].length;y++){
// reactor[x][y]=new...