mirror of
https://github.com/osmarks/random-stuff
synced 2024-11-08 13:39:53 +00:00
116 lines
5.0 KiB
HTML
116 lines
5.0 KiB
HTML
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<body>
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<script src="https://unpkg.com/mithril/mithril.js"></script>
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<script>
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let people = 3
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let info = []
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let pointsForRank = ""
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const regenerateInfo = () => {
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if (info.length > people) {
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info = info.slice(0, people)
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}
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if (info.length < people) {
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info = JSON.parse(JSON.stringify(info.concat(new Array(people - info.length).fill({ rank: "", weighting: 1 }))))
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}
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}
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regenerateInfo()
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const changeCount = ev => {
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people = parseInt(ev.target.value)
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regenerateInfo()
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}
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const permutations = xs => {
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if (xs.length === 0) { return [[]] }
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const result = []
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for (let i = 0; i < xs.length; i++) {
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const listWithoutIth = xs.slice(0, i).concat(xs.slice(i + 1))
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for (const perm of permutations(listWithoutIth)) {
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result.push([xs[i]].concat(perm))
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}
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}
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return result
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}
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const range = n => new Array(n).fill(null).map((x, i) => i)
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let result = ""
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const targetPerms = 5
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const solve = () => {
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const points = pointsForRank.split(",").map(parseFloat)
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if (points.length !== people) {
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throw "There must be as many points defined as ranks."
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} else if (!points.every(x => !isNaN(x))) {
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throw "Invalid number"
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}
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const pointsForPerson = []
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for (let i = 0; i < info.length; i++) {
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const inf = info[i]
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const rankOrder = inf.rank.split(",").map(parseFloat)
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const sortedCopy = Array.from(rankOrder)
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sortedCopy.sort((a, b) => a - b)
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console.log(JSON.stringify(sortedCopy), JSON.stringify(range(people).map(x => x + 1)))
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if (rankOrder.length !== people) {
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throw `Person ${i + 1}'s ranking is too short/long.`
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} else if (!rankOrder.every(x => !isNaN(x))) {
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throw `Person ${i + 1}'s ranking contains an invalid number.`
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} else if (JSON.stringify(sortedCopy) !== JSON.stringify(range(people).map(x => x + 1))) {
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throw `Person ${i + 1}'s ranking is not a valid permutation.`
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}
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const newx = new Array(people).fill(null)
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for (let j = 0; j < people; j++) {
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const thingWithJthRank = rankOrder[j] - 1
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newx[thingWithJthRank] = inf.weighting * points[j]
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}
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pointsForPerson.push(newx)
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}
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console.log("got", points, pointsForPerson)
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let bestPerms = []
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for (const perm of permutations(range(people))) { // ith person gets perm[i]th thing person
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const score = perm.map((person, thingIndex) => pointsForPerson[person][thingIndex]).reduce((a, b) => a + b, 0)
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for (let i = 0; i < bestPerms.length; i++) {
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const [otherPerm, otherScore] = bestPerms[i]
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if (otherScore < score) {
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bestPerms.splice(i, 1)
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break
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}
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}
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if (bestPerms.length < targetPerms) {
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bestPerms.push(([perm, score]))
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}
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}
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bestPerms.sort((a, b) => b[1] - a[1])
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return m("", [
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"Solutions found:",
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m("ul", bestPerms.map(([bestPerm, bestScore]) => m("li", bestPerm.map((person, thingIndex) => `Person ${person + 1} gets ${thingIndex + 1}`).join("; ") + ` (${bestScore} points).`)))
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])
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}
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const solveWrapper = () => {
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try {
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result = solve()
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} catch(e) {
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console.warn(e)
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result = e.toString()
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}
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}
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m.mount(document.body, {
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view: function() {
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return [
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m("p", "Rank orders must be given as comma-separated one-indexed integers. The points for each rank must be given as comma-separated real numbers."),
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m("input", { value: pointsForRank, placeholder: "Points for ranks", oninput: ev => { pointsForRank = ev.target.value } }),
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m("", [ m("label", "People: "), m("input[type=number]", { value: people, oninput: changeCount }) ]),
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m("", info.map((i, index) => m("", [
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m("label", `Person ${index + 1}: `),
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m("input", { value: i.rank, placeholder: "Ranking", oninput: ev => { i.rank = ev.target.value } }),
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m("label", " Weighting: "), m("input[type=number]", { value: i.weighting, oninput: ev => { i.weighting = parseFloat(ev.target.value) }, step: 0.1 })
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]))),
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m("button", { onclick: solveWrapper }, "Solve"),
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m("", result)
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]
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}
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})
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</script>
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</body>
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