metro lines

const fs = require("fs");
data = fs.readFileSync("./metro.in", "utf-8");
arr = data.split("\r\n").map(i => i.split(" ").map(k => parseInt(k)));
//n,m,S,E,x,y
get_to_end = ( lines, s, e) => {
    if (s == e) {
        return [];
    } else {
        cl = lines.filter(line => line[0] == s).sort((a, b) => a.length - b.length)[0];
        return cl != undefined ? [cl].concat(get_to_end(lines, cl[cl.length - 1], e)) : [];
    }
};
do_test_cases = (i) => {
    if (i < arr.length) {
        [s, e] = [arr[i][2], arr[i][3]];
        lines = [];
        for (j = i + 1; j <= i + arr[i][1]; j++)
            lines.push(arr[j].slice(1, arr[j].length));
        route = get_to_end(lines, s, e);
        console.log(route.slice(-1)[0].slice(-1)[0] == e ? route.reduce((c, n, i) => c + (i + 1 != route.length - 1 ? 5 : 0) + ((n.length - 2) * 2), ((route[0].length - 2) * 2)) : "impossible");
        do_test_cases(i + arr[i][1] + 1);
    }
};
do_test_cases(0);