make 33333 from [0, 10).js

// https://twitter.com/tatsuosakamoto/status/1299922512474640387

(()=>{

let strategy = [[]];
let answer = [];


// register approaches to strategy
for(let i=0;i<5;i++){
	let next = [];
	for(let j=0;j<strategy.length;j++){
		let current = strategy[j];
		switch(current[i-1]){
		case undefined:
		case -7:
		case 3:
			next.push(current.concat(3));
			if(i !== 4){
				next.push(current.concat(4));
			}
		break;
		case 4:
		case -6:
			next.push(current.concat(-7));
			if(i !== 4){
				next.push(current.concat(-6));
			}
		break;
		default:
		break;
		}
	}
	strategy = next;
}

//answer: strategy, branch, {subtractee, subtracter}, digit -> [0, 10)
for(let h=0;h<strategy.length;h++){
  let st_current = strategy[h];
  answer.push([{subtractee: [], subtracter: []}]);
	for(let i=0;i<5;i++){
	  let next = [];
		switch(st_current[i]){
		  case -7:
		  	for(let j=0;j<answer[h].length;j++){
		  	  let current = answer[h][j];
		  		next.push({subtractee: current.subtractee.concat(2)
						, subtracter: current.subtracter.concat(9)});
		  		next.push({subtractee: current.subtractee.concat(1)
						, subtracter: current.subtracter.concat(8)});
		  		next.push({subtractee: current.subtractee.concat(0)
						, subtracter: current.subtracter.concat(7)});
		  	}
		  break;
		  case -6:
		  	for(let j=0;j<answer[h].length;j++){
		  	  let current = answer[h][j];
		  		next.push({subtractee: current.subtractee.concat(3)
						, subtracter: current.subtracter.concat(9)});
		  		next.push({subtractee: current.subtractee.concat(2)
						, subtracter: current.subtracter.concat(8)});
		  		next.push({subtractee: current.subtractee.concat(1)
						, subtracter: current.subtracter.concat(7)});
		  		next.push({subtractee: current.subtractee.concat(0)
						, subtracter: current.subtracter.concat(6)});
		  	}
		  break;
		  case 3:
		  	for(let j=0;j<answer[h].length;j++){
		  	  let current = answer[h][j];
		  		next.push({subtractee: current.subtractee.concat(9)
						, subtracter: current.subtracter.concat(6)});
		  		next.push({subtractee: current.subtractee.concat(8)
						, subtracter: current.subtracter.concat(5)});
		  		next.push({subtractee: current.subtractee.concat(7)
						, subtracter: current.subtracter.concat(4)});
		  		next.push({subtractee: current.subtractee.concat(6)
						, subtracter: current.subtracter.concat(3)});
		  		next.push({subtractee: current.subtractee.concat(5)
						, subtracter: current.subtracter.concat(2)});
		  		next.push({subtractee: current.subtractee.concat(4)
						, subtracter: current.subtracter.concat(1)});
		  		next.push({subtractee: current.subtractee.concat(3)
						, subtracter: current.subtracter.concat(0)});
		  	}
		  break;
		  case 4:
		  	for(let j=0;j<answer[h].length;j++){
		  	  let current = answer[h][j];
		  		next.push({subtractee: current.subtractee.concat(9)
						, subtracter: current.subtracter.concat(5)});
		  		next.push({subtractee: current.subtractee.concat(8)
						, subtracter: current.subtracter.concat(4)});
		  		next.push({subtractee: current.subtractee.concat(7)
						, subtracter: current.subtracter.concat(3)});
		  		next.push({subtractee: current.subtractee.concat(6)
						, subtracter: current.subtracter.concat(2)});
		  		next.push({subtractee: current.subtractee.concat(5)
						, subtracter: current.subtracter.concat(1)});
		  		next.push({subtractee: current.subtractee.concat(4)
						, subtracter: current.subtracter.concat(0)});
		  	}
		  break;
		}
		for(let j=0;j<next.length;j++){
			let current = next[j];
			let used = [];
			let flag = true;
			for(let k=0;flag && k<current.subtractee.length;k++){
				if(used.some(e=>(e === current.subtractee[k]))){
					flag = false;
				}
				used.push(current.subtractee[k]);
			}
			for(let k=0;flag && k<current.subtracter.length;k++){
				if(used.some(e=>(e === current.subtracter[k]))){
					flag = false;
				}
				used.push(current.subtracter[k]);
			}
			if(!flag)
				next[j] = undefined;
		}
		answer[h] = next.filter(e => e);
	}


	//beautification
	answer[h] = answer[h].map(e => e.subtractee.join("") + " - " + e.subtracter.join("") + " = 33333").join("\n");
	strategy[h] = strategy[h].map(e => "make " + e).join(" & ");
}




return strategy.map((e, i)=>({strategy: e, answer: answer[i]}));
})()