Lotto

.envrc

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+use flake

.gitignore

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+/target
+/.direnv
+
+
+# Added by cargo
+#
+# already existing elements were commented out
+
+#/target
+
+
+# Added by cargo
+#
+# already existing elements were commented out
+
+#/target

Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "cfg-if"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
+
+[[package]]
+name = "getrandom"
+version = "0.2.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "94b22e06ecb0110981051723910cbf0b5f5e09a2062dd7663334ee79a9d1286c"
+dependencies = [
+ "cfg-if",
+ "libc",
+ "wasi",
+]
+
+[[package]]
+name = "libc"
+version = "0.2.154"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ae743338b92ff9146ce83992f766a31066a91a8c84a45e0e9f21e7cf6de6d346"
+
+[[package]]
+name = "lotto"
+version = "0.1.0"
+dependencies = [
+ "rand",
+]
+
+[[package]]
+name = "ppv-lite86"
+version = "0.2.17"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5b40af805b3121feab8a3c29f04d8ad262fa8e0561883e7653e024ae4479e6de"
+
+[[package]]
+name = "rand"
+version = "0.8.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "34af8d1a0e25924bc5b7c43c079c942339d8f0a8b57c39049bef581b46327404"
+dependencies = [
+ "libc",
+ "rand_chacha",
+ "rand_core",
+]
+
+[[package]]
+name = "rand_chacha"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e6c10a63a0fa32252be49d21e7709d4d4baf8d231c2dbce1eaa8141b9b127d88"
+dependencies = [
+ "ppv-lite86",
+ "rand_core",
+]
+
+[[package]]
+name = "rand_core"
+version = "0.6.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ec0be4795e2f6a28069bec0b5ff3e2ac9bafc99e6a9a7dc3547996c5c816922c"
+dependencies = [
+ "getrandom",
+]
+
+[[package]]
+name = "wasi"
+version = "0.11.0+wasi-snapshot-preview1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9c8d87e72b64a3b4db28d11ce29237c246188f4f51057d65a7eab63b7987e423"

Cargo.toml

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+[package]
+name = "lotto"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+rand = "0.8.5"

flake.lock

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+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1714635257,
+        "narHash": "sha256-4cPymbty65RvF1DWQfc+Bc8B233A1BWxJnNULJKQ1EY=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "63c3a29ca82437c87573e4c6919b09a24ea61b0f",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

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+{
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+  outputs = {
+    self,
+    nixpkgs,
+  }: let
+    inherit (self) outputs;
+    supportedSystems = [
+      "x86_64-linux"
+      "aarch64-linux"
+
+      "x86_64-darwin"
+      "aarch64-darwin"
+    ];
+    forEachSupportedSystem = nixpkgs.lib.genAttrs supportedSystems;
+  in {
+    devShells = forEachSupportedSystem (system: let
+      pkgs = import nixpkgs {inherit system;};
+    in {
+      rust-dev = pkgs.mkShell {
+        buildInputs = with pkgs; [
+          cargo
+          rustc
+          rustfmt
+          rustPackages.clippy
+          rust-analyzer
+          lldb
+          pkg-config
+        ];
+      };
+
+      default = outputs.devShells.${system}.rust-dev;
+    });
+  };
+}

src/main.rs

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+use rand::Rng;
+use std::time::Instant;
+
+type Ticket = [u8; 5];
+const NUM_ENTRIES: usize = 10_000_000;
+
+// println!("char: {}", rand::random::<char>());
+
+fn gen_num() -> u8 {
+    rand::thread_rng().gen_range(0..90)
+}
+
+fn gen_ticket() -> Ticket {
+    let num1 = gen_num();
+    let mut num2: u8 = gen_num();
+    while num2 == num1 {
+        num2 = gen_num()
+    }
+    let mut num3: u8 = gen_num();
+    while num3 == num1 || num3 == num2 {
+        num3 = gen_num()
+    }
+    let mut num4: u8 = gen_num();
+    while num4 == num1 || num4 == num2 || num4 == num3 {
+        num4 = gen_num()
+    }
+    let mut num5: u8 = gen_num();
+    while num5 == num1 || num5 == num2 || num5 == num3 || num5 == num4 {
+        num5 = gen_num()
+    }
+    [num1, num2, num3, num4, num5]
+}
+
+fn num_matches(t1: Ticket, t2: Ticket) -> usize {
+    let mut result = 0;
+    for n1 in t1 {
+        for n2 in t2 {
+            if n1 == n2 {
+                result += 1;
+            }
+        }
+    }
+    result
+}
+
+fn main() {
+    println!("Generating entries");
+    let mut entries: Vec<Ticket> = Vec::with_capacity(NUM_ENTRIES);
+    for _ in 0..NUM_ENTRIES {
+        entries.push(gen_ticket());
+    }
+    let winning = gen_ticket();
+
+    let start = Instant::now();
+
+    println!("Counting winners...");
+    let mut winners: [usize; 6] = [0, 0, 0, 0, 0, 0];
+
+    for n in entries {
+        let num_winning = num_matches(n, winning);
+        winners[num_winning] += 1
+    }
+
+    let duration = start.elapsed();
+
+    println!(
+        "Winners: {:?}\nTime Elapsed: {}ms",
+        winners,
+        duration.subsec_millis()
+    );
+}