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Alexander 2025-11-25 16:58:15 -05:00
parent 2fc6c4ea90
commit 637093861d
8 changed files with 321 additions and 2 deletions
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8
.idea/.gitignore generated vendored Normal file
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# Editor-based HTTP Client requests
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# Datasource local storage ignored files
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11
.idea/gifts.iml generated Normal file
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8
.idea/modules.xml generated Normal file
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<?xml version="1.0" encoding="UTF-8"?>
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6
.idea/vcs.xml generated Normal file
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5
.vscode/settings.json vendored Normal file
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{
"cSpell.words": [
"aggs"
]
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148
Cargo.lock generated Normal file
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# This file is automatically @generated by Cargo.
# It is not intended for manual editing.
version = 4
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1
Cargo.toml
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@ -4,3 +4,4 @@ version = "0.1.0"
edition = "2024"
[dependencies]
rand = "0.9.2"

136
src/main.rs
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@ -1,3 +1,135 @@
fn main() {
println!("Hello, world!");
use rand::rng;
use rand::seq::SliceRandom;
use std::fmt::{Display, Formatter};
/// `pick` must be an bijection
trait Player {
/// takes a cycle number and returns a box index
fn choose(&mut self, cycle: usize, num_boxes: usize) -> usize;
fn desc(&self) -> &'static str;
}
#[derive(Debug)]
struct LinearPlayer {}
impl Player for LinearPlayer {
fn choose(&mut self, cycle: usize, _: usize) -> usize {
return cycle;
}
fn desc(&self) -> &'static str {
"Linear"
}
}
#[derive(Debug)]
struct EvenOddPlayer {}
impl Player for EvenOddPlayer {
fn choose(&mut self, cycle: usize, num_boxes: usize) -> usize {
if cycle < (num_boxes + 1) / 2 {
cycle * 2
} else {
(cycle - (num_boxes + 1) / 2) * 2 + 1
}
}
fn desc(&self) -> &'static str {
"EvenOdd"
}
}
#[derive(Debug, Default, Clone, Copy)]
struct AggInfo {
wins: usize,
ties: usize,
losses: usize,
}
impl Display for AggInfo {
fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
write!(f, "wins: {}\tties: {}\tlosses: {}", self.wins, self.ties, self.losses)
}
}
fn play_once(
players: &mut Vec<Box<dyn Player>>,
aggs: &mut Vec<AggInfo>,
boxes: &Vec<bool>,
num_gifts: usize,
) {
let mut winners: Vec<usize> = vec![];
let mut counts: Vec<usize> = vec![0; players.len()];
for cycle in 0..boxes.len() {
let choices = {
let mut cs = vec![];
for pi in 0..players.len() {
cs.push(players[pi].choose(cycle, boxes.len()));
}
cs
};
for pi in 0..players.len() {
if boxes[choices[pi]] {
counts[pi] += 1;
if counts[pi] == num_gifts {
winners.push(pi);
}
}
}
if !winners.is_empty() {
break;
}
}
for ai in 0..aggs.len() {
aggs[ai].losses += 1;
}
if winners.len() == 1 {
aggs[winners[0]].losses -= 1;
aggs[winners[0]].wins += 1;
} else {
for wi in 0..winners.len() {
aggs[winners[wi]].losses -= 1;
aggs[winners[wi]].ties += 1;
}
}
}
/// returns a vector of aggregate info corresponding by index to `players`
fn eval(
n: usize,
players: &mut Vec<Box<dyn Player>>,
num_boxes: usize,
num_gifts: usize,
) -> Vec<AggInfo> {
let mut rng = rng();
let mut boxes: Vec<bool> = vec![false; num_boxes - num_gifts];
boxes.append(&mut vec![true; num_gifts]);
let mut aggs = vec![AggInfo::default(); players.len()];
for round in 0..n {
boxes.shuffle(&mut rng);
play_once(players, &mut aggs, &boxes, num_gifts);
}
aggs
}
pub fn main() {
let mut players: Vec<Box<dyn Player>> = vec![
Box::new(LinearPlayer {}),
Box::new(EvenOddPlayer {}),
];
let agg = eval(10000, &mut players, 100, 26);
for pi in 0..players.len() {
println!("{}\t| {}", players[pi].desc(), agg[pi]);
}
}