Solutions
Solution 1 (Click to Show/Hide)
function solve(input) {
var orig = {};
input.forEach(function(e) {
orig[e.replace(/\s/g, "").toLowerCase()] = e;
})
input = Object.keys(orig)
var map = {};
for (var i = 0; i < input.length - 1; i++) {
var pair0 = input[i];
for (var j = i + 1; j < input.length; j++) {
var pair = [pair0, input[j]];
var s = pair0 + pair[1];
var key = s.split("").sort();
var val = map[key] ? map[key] : [];
val.push(pair);
map[key] = val;
}
}
var result = [];
Object.keys(map).forEach((key) => {
for (var i = 0; i < map[key].length - 1; i++) {
var a = map[key][i];
for (var j = i + 1; j < map[key].length; j++) {
var b = map[key][j];
if ((new Set([a[0], b[0], a[1], b[1]])).size < 4)
continue;
var from = [orig[a[0]], orig[a[1]]].sort()
var to = [orig[b[0]], orig[b[1]]].sort()
result.push({
from,
to
})
}
}
});
return result;
}