diff --git a/misc/.envrc b/misc/.envrc
new file mode 100644
index 00000000..2ddd3a9c
--- /dev/null
+++ b/misc/.envrc
@@ -0,0 +1,3 @@
+# shellcheck shell=bash
+source $HOME/.config/direnv/envrc
+use flake
diff --git a/misc/flake.lock b/misc/flake.lock
new file mode 100644
index 00000000..477036c5
--- /dev/null
+++ b/misc/flake.lock
@@ -0,0 +1,61 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1731533236,
+        "narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1736241350,
+        "narHash": "sha256-CHd7yhaDigUuJyDeX0SADbTM9FXfiWaeNyY34FL1wQU=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "8c9fd3e564728e90829ee7dbac6edc972971cd0f",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/misc/flake.nix b/misc/flake.nix
new file mode 100644
index 00000000..f7f86888
--- /dev/null
+++ b/misc/flake.nix
@@ -0,0 +1,18 @@
+{
+  description = "A basic flake with a shell";
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+  inputs.flake-utils.url = "github:numtide/flake-utils";
+
+  outputs = { self, nixpkgs, flake-utils }:
+    flake-utils.lib.eachDefaultSystem (system: let
+      pkgs = nixpkgs.legacyPackages.${system};
+    in {
+      devShells.default = pkgs.mkShell {
+        packages = [
+          pkgs.bashInteractive
+          pkgs.graphviz
+          pkgs.julia-bin
+        ];
+      };
+    });
+}
diff --git a/misc/grid18.jl b/misc/grid18.jl
new file mode 100755
index 00000000..a45cfecb
--- /dev/null
+++ b/misc/grid18.jl
@@ -0,0 +1,37 @@
+#!/usr/bin/env julia
+import Pkg
+# Pkg.add("JSON"),
+# Pkg.add("Plots"),
+# Pkg.add("GridVisualize"),
+# Pkg.add("Colors"),
+using JSON, Plots, Colors
+
+grid_data = JSON.parse(read("2024/day18.json", String))["line"]
+
+# Extract dimensions of the grid
+rows = 1 + maximum([g[1] for g in grid_data])
+cols = 1 + maximum([g[2] for g in grid_data])
+len = length(grid_data)
+
+# Create an empty matrix for plotting purposes
+grid_matrix = fill(RGB(1.0, 1.0, 1.0), rows, cols)
+for (i, g) in enumerate(grid_data)
+    c = (len - i) / len
+    grid_matrix[g[1]+1, g[2]+1] = RGB(c, c, c)
+end
+grid_matrix[1, 1] = RGB(1.0, 0.0, 0.0)
+
+# color_map = Dict(
+#     :red => RGB(1.0, 0.0, 0.0),
+#     :white => RGB(1.0, 1.0, 1.0),
+#     :black => RGB(0.0, 0.0, 0.0),
+# )
+# color_matrix = [color_map[element] for element in grid_matrix]
+
+heatmap(
+    # color_matrix,
+    grid_matrix,
+    title="Y2024 day18",
+    aspect_ratio=:equal
+)
+savefig("day18-grid.png")
diff --git a/misc/hist2024.jl b/misc/hist2024.jl
new file mode 100755
index 00000000..fd78a36a
--- /dev/null
+++ b/misc/hist2024.jl
@@ -0,0 +1,34 @@
+#!/usr/bin/env julia
+# import Pkg
+# Pkg.add("JSON")
+# Pkg.add("Plots")
+# Pkg.add("KernelDensity")
+using JSON, Plots, KernelDensity
+
+data2024 = read("2024/execution_time.json", String)
+data = JSON.parse(data2024)
+times = [item["time"] for item in data if haskey(item, "time")]
+tl = log2.(times)
+ktd = kde(tl)
+
+histogram(
+    tl,
+    xlims=(-5, 20),
+    ylims=(0, 0.4),
+    bins=20,
+    normalize=true,
+    title="AoC2024 execution time distribution in Rust",
+    xlabel="log2(time[ms])",
+    # xlabel="時間",
+    ylabel="Freq",
+    legend=false,
+    # fontfamily="Noto Sans CJK JP"
+)
+plot!(
+    ktd.x,
+    ktd.density,
+    ylims=(0, 0.4),
+    color=:red,
+    linewidth=2)
+
+savefig("hist2024.png")