Add nim solution

nim-solution/.envrc

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+use flake

nim-solution/.gitignore

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+/target
+/.direnv
+/lotto

nim-solution/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
+}

nim-solution/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 {
+      nim-dev = pkgs.mkShell {
+        buildInputs = with pkgs; [
+          nim
+          nimble
+          nimlangserver
+        ];
+      };
+
+      default = outputs.devShells.${system}.nim-dev;
+    });
+  };
+}

nim-solution/lotto.nimble

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+# Package
+
+version       = "0.1.0"
+author        = "Daniel Flanagan"
+description   = "Lotto winner finder"
+license       = "Proprietary"
+srcDir        = "src"
+bin           = @["lotto"]
+
+
+# Dependencies
+
+requires "nim >= 2.0.2"

nim-solution/readme.md

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+# lotto
+
+```bash
+nimble run -d:release --passC:"-march=native"
+```

nim-solution/src/lotto.nim

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+import std/[times, strutils, sequtils, options]
+
+type Ticket = array[5, uint8]
+
+proc to_ticket(s: seq[int]): Ticket =
+  for i, n in result.mpairs:
+    n = s[i].uint8
+
+proc parse_ticket(l: string): Option[Ticket] =
+  let candidate = l.split(' ', 5).map(parseInt).filterIt(it <= 90 and it > 0)
+  if candidate.len < 5:
+    return Ticket.none
+  candidate.to_ticket().some()
+
+proc num_matches(t1: Ticket, t2: Ticket): uint =
+  for n1 in t1:
+    for n2 in t2:
+      if n1 == n2:
+        result.inc
+
+let startTime = cpuTime()
+echo "Starting..."
+const NUM_ENTRIES = 10_000_000
+var entries = newSeqOfCap[Ticket] NUM_ENTRIES
+
+for l in "/mytmpfs/10m-v2.txt".lines:
+  let t = l.parse_ticket
+  if t.isSome:
+    entries.add t.get
+
+echo "Parse time taken: ", (cpuTime() - startTime), " seconds"
+
+let winning: Ticket = [68, 81, 40, 34, 85]
+let countTime = cpuTime()
+var winners: array[6, uint] = [0, 0, 0, 0, 0, 0]
+for n in entries:
+  winners[n.num_matches(winning)].inc
+echo winners, "\nTime taken: ", (cpuTime() - countTime), " seconds"