「🎉」 init(2025): day 1

2024/day04/.envrc

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+use flake

2024/day04/flake.lock

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+{
+  "nodes": {
+    "nixpkgs": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1733120037,
+        "narHash": "sha256-En+gSoVJ3iQKPDU1FHrR6zIxSLXKjzKY+pnh9tt+Yts=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "f9f0d5c5380be0a599b1fb54641fa99af8281539",
+        "type": "github"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "ref": "nixos-24.11",
+        "type": "indirect"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

2024/day04/flake.nix

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+{
+  description = "a test development environment for python";
+
+  inputs = {
+
+    nixpkgs = {
+      url = "nixpkgs/nixos-24.11";
+      flake = false;
+	};
+
+  };
+
+  outputs = inputs@{ nixpkgs, ... }:
+	{
+    devShell = {
+      x86_64-linux = let
+        pkgs = import nixpkgs { system = "x86_64-linux"; };
+      in pkgs.mkShell {
+        packages = with pkgs; [
+          gcc python3
+        ];
+        shellHook = ''
+          echo -e "\x1B[0;33mentering python test development environment...\x1B[0m"
+        '';
+      };
+    };
+  };
+}

2024/day04/part1.py

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+# sorry i gave up.
+
+import os
+import os.path
+
+target = "XMAS"
+
+def count_horizontal(grid):
+    res = 0
+    for line in grid:
+        res += line.count(target)
+        res += line[::-1].count(target)
+    return (res)
+
+def count_vertical(grid):
+    res = 0
+    for i in range(len(grid[0])):
+        res += (''.join([s[i] for s in grid if len(s) > i])).count(target)
+        res += (''.join([s[i] for s in grid if len(s) > i]))[::-1].count(target)
+    return (res)
+
+def count_diagonal_left(grid):
+    res = 0
+    for i in range(len(grid)):
+        res += (''.join([grid[x + i][x] for x in range(min(len(grid) - i, len(grid[0])))])).count(target)
+        res += (''.join([grid[x + i][x] for x in range(min(len(grid) - i, len(grid[0])))]))[::-1].count(target)
+    for i in range(1,len(grid[0])):
+        res += (''.join([grid[x][x + i] for x in range(min(len(grid), len(grid[0]) - i))])).count(target)
+        res += (''.join([grid[x][x + i] for x in range(min(len(grid), len(grid[0]) - i))]))[::-1].count(target)
+    return (res)
+
+def count_diagonal_right(grid):
+    res = 0
+    for i in range(len(grid)):
+        res += (''.join([(grid[x + i][::-1])[x] for x in range(min(len(grid) - i, len(grid[0])))])).count(target)
+        res += (''.join([(grid[x + i][::-1])[x] for x in range(min(len(grid) - i, len(grid[0])))]))[::-1].count(target)
+    for i in range(1,len(grid[0])):
+        res += (''.join([(grid[x][::-1])[x + i] for x in range(min(len(grid), len(grid[0]) - i))])).count(target)
+        res += (''.join([(grid[x][::-1])[x + i] for x in range(min(len(grid), len(grid[0]) - i))]))[::-1].count(target)
+    return (res)
+
+
+def main():
+    file_path = "./input.txt"
+    if (os.path.isfile(file_path)):
+        content = open(file_path, "r").read()
+    else:
+        content = "MMMSXXMASM\nMSAMXMSMSA\nAMXSXMAAMM\nMSAMASMSMX\nXMASAMXAMM\nXXAMMXXAMA\nSMSMSASXSS\nSAXAMASAAA\nMAMMMXMMMM\nMXMXAXMASX"
+    grid = content.split('\n')
+    print(count_horizontal(grid) + count_vertical(grid) + count_diagonal_left(grid) + count_diagonal_right(grid))
+
+if __name__ == '__main__':
+    main()

2024/day04/part2.py

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+# sorry i gave up.
+
+import os
+import os.path
+
+target = "XMAS"
+
+def check_x(grid, x, y):
+    if (x not in range(1, len(grid[0]) - 1) or y not in range(1, len(grid) - 1)):
+        return (0)
+    str = grid[y - 1][x - 1] + grid[y + 1][x + 1]
+    if (str not in "SMS"):
+        return (0)
+    str = grid[y + 1][x - 1] + grid[y - 1][x + 1]
+    if (str not in "SMS"):
+        return (0)
+    return (1)
+
+def count_xmas(grid):
+    res = 0
+    for y in range(len(grid)):
+        for x in range(len(grid[0])):
+            if (grid[y][x] == 'A'):
+                res += check_x(grid, x, y)
+    return (res)
+
+
+def main():
+    file_path = "./input.txt"
+    if (os.path.isfile(file_path)):
+        content = open(file_path, "r").read()
+    else:
+        content = "MMMSXXMASM\nMSAMXMSMSA\nAMXSXMAAMM\nMSAMASMSMX\nXMASAMXAMM\nXXAMMXXAMA\nSMSMSASXSS\nSAXAMASAAA\nMAMMMXMMMM\nMXMXAXMASX"
+    grid = content.split('\n')
+    print(count_xmas(grid))
+
+if __name__ == '__main__':
+    main()