From 8e2faa487c192478327f79bb15647dd75e78e970 Mon Sep 17 00:00:00 2001 From: Dustin Swan Date: Sun, 3 Dec 2023 22:37:48 -0700 Subject: [PATCH] I'm terrible at Zig wow --- day3/data.txt | 140 ++++++++++++++++++++++++++++++++++++++++++++++++++ day3/lib.zig | 12 +++++ day3/main.zig | 111 +++++++++++++++++++++++++++++++++++++++ day3/test.txt | 10 ++++ 4 files changed, 273 insertions(+) create mode 100644 day3/data.txt create mode 100644 day3/lib.zig create mode 100644 day3/main.zig create mode 100644 day3/test.txt diff --git a/day3/data.txt b/day3/data.txt new file mode 100644 index 0000000..4cb1d1c --- /dev/null +++ b/day3/data.txt @@ -0,0 +1,140 @@ +.......358..........31.....339.....669.............598......328.....575......................447..650..............964...........692........ +...............415..*.........@......*...627*...................945*.............144/.506............................*......514...*...150... 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+.236..............153......163........*.414...........................................549........432............919............81.....-337.. +....*.................604......-...631..........879........240.......97...............*.....315....&...720..........610...530............... +.....856...214..236....*.....159.%......738.....-......826....&.272.*.......36.....465.........../.....*...587.......*....*......548..699... +.............*........36..........743.=.../...............*......*..424.................580.#...897.448....*.......833...633.....*...*...... +.............963......................542........734.....901...914..........843.............523..........818..................691.....833... diff --git a/day3/lib.zig b/day3/lib.zig new file mode 100644 index 0000000..941df5f --- /dev/null +++ b/day3/lib.zig @@ -0,0 +1,12 @@ +const std = @import("std"); + +pub fn splitArrayIntoArrayList(content: []const u8, char: *const [1:0]u8) !std.ArrayList([]const u8) { + const allocator = std.heap.page_allocator; + var grid = std.ArrayList([]const u8).init(allocator); + var lines = std.mem.split(u8, content, char); + + while (lines.next()) |line| { + try grid.append(line); + } + return grid; +} diff --git a/day3/main.zig b/day3/main.zig new file mode 100644 index 0000000..bebfce4 --- /dev/null +++ b/day3/main.zig @@ -0,0 +1,111 @@ +const std = @import("std"); +const lib = @import("lib.zig"); + +const Number = struct { row: usize, col: usize, length: usize, value: u32 }; + +pub fn main() !void { + const content = @embedFile("data.txt"); + const grid = try lib.splitArrayIntoArrayList(content, "\n"); + defer grid.deinit(); + + const numbers = try parseNumbers(grid); + + var total1: u128 = 0; + + for (numbers.items) |n| { + if (numberTouchesSymbol(n, grid)) { + total1 += n.value; + } + } + + std.debug.print("total1 {d}\n", .{total1}); + + var total2: u128 = 0; + for (grid.items, 0..) |line, row| { + for (line, 0..) |val, col| { + if (val == '*') { + total2 += try findGearRatio(row, col, numbers); + } + } + } + std.debug.print("total2 {d}\n", .{total2}); +} + +fn findGearRatio(row: usize, col: usize, numbers: std.ArrayList(Number)) !u32 { + const touching = try findNumbersTouchingCell(row, col, numbers); + if (touching.items.len != 2) { + return 0; + } + return touching.items[0].value * touching.items[1].value; +} + +fn findNumbersTouchingCell(row: usize, col: usize, numbers: std.ArrayList(Number)) !std.ArrayList(Number) { + const allocator = std.heap.page_allocator; + var touching = std.ArrayList(Number).init(allocator); + + for (numbers.items) |n| { + // itreate over each digit in the number + for (0..n.length) |i| { + // TODO: upgrade to Zig .12 to get @abs + // if (@abs(n.row - row) < 1 and @abs(n.col + i - col) < 1) { + if ((n.row == row or n.row + 1 == row or n.row == row + 1) and (n.col + i == col or n.col + 1 + i == col or n.col + i == col + 1)) { + try touching.append(n); + break; + } + } + } + return touching; +} + +fn numberTouchesSymbol(n: Number, grid: std.ArrayList([]const u8)) bool { + const items = grid.items; + const width = items[0].len; + const height = items.len - 1; // TODO: fix extra crap when i read files.. + + // itreate over each digit in the number + for (0..n.length) |i| { + // over the 3 nearest rows + for (0..3) |r| { + // and the 3 nearest columns + for (0..3) |c| { + const outOfBounds = (r == 0 and n.row == 0) or (c == 0 and n.col + i == 0) or (r == 2 and n.row + 1 == height) or (c == 2 and n.col + i + 1 == width); + + if (!outOfBounds) { + const row = n.row + r - 1; + const col = n.col + c + i - 1; + const val = items[row][col]; + if (!std.ascii.isDigit(val) and val != '.') { + return true; + } + } + } + } + } + return false; +} + +fn parseNumbers(grid: std.ArrayList([]const u8)) !std.ArrayList(Number) { + const allocator = std.heap.page_allocator; + var numbers = std.ArrayList(Number).init(allocator); + + for (grid.items, 0..) |line, row| { + var numList = std.ArrayList(u8).init(allocator); + defer numList.deinit(); + + for (line, 0..) |val, col| { + if (std.ascii.isDigit(val)) { + try numList.append(val); + } + + // if we have a number started, and we've encountered a non-digit (or the end of the grid) + if (numList.items.len != 0 and (!std.ascii.isDigit(val) or col == line.len - 1)) { + const parsed = try std.fmt.parseInt(u32, numList.items, 10); + const length = numList.items.len; + try numbers.append(Number{ .row = row, .col = col - length, .length = length, .value = parsed }); + numList.items.len = 0; + } + } + } + + return numbers; +} diff --git a/day3/test.txt b/day3/test.txt new file mode 100644 index 0000000..b20187f --- /dev/null +++ b/day3/test.txt @@ -0,0 +1,10 @@ +467..114.. +...*...... +..35..633. +......#... +617*...... +.....+.58. +..592..... +......755. +...$.*.... +.664.598..