20 lines
706 B
JavaScript
20 lines
706 B
JavaScript
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var items = "abcdefghijklmnop".split("");
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s = (i) => {items = items.splice(-i).concat(items);}
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x = (a,b) => {[items[a], items[b]] = [items[b], items[a]]}
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p = (a,b) => {x(items.indexOf(a), items.indexOf(b))}
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var input = require("fs").readFileSync("input.txt").toString().replace("\n", "");
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var input = "," + input + ",";
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var expr = input.replace(/,/g, ");").replace(/;([sxp])/g, ";$1(").replace(/([a-z])\/([a-z])/g, "'$1'/'$2'").replace(/\//g, ",");
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expr = expr.substring(2);
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var state = "";
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var states = [];
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while(states.indexOf(state) == -1){
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states.push(state);
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eval(expr);
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state = items.join("");
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}
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states = states.filter((a)=>(a));
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var num = 1000000000;
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console.log(states[(num-1)%states.length]);
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