solutions day1 and day2

7 files changed, 2220 insertions, 0 deletions

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..bc5bffb
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+zig-out/
+.zig-cache
diff --git a/build.zig b/build.zig
new file mode 100644
index 0000000..3234a16
--- /dev/null
+++ b/build.zig
@@ -0,0 +1,7 @@
+const std = @import("std");
+const print = std.debug.print;
+
+pub fn build(b: *std.Build) void {
+    const exe = b.addExecutable(.{ .name = "day01", .root_source_file = b.path("main.zig"), .target = b.standardTargetOptions(.{}), .optimize = .ReleaseFast });
+    b.installArtifact(exe);
+}
diff --git a/inputs/day01.txt b/inputs/day01.txt
new file mode 100644
index 0000000..2755b49
--- /dev/null
+++ b/inputs/day01.txt
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diff --git a/inputs/day02.txt b/inputs/day02.txt
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diff --git a/main.zig b/main.zig
new file mode 100644
index 0000000..4facde2
--- /dev/null
+++ b/main.zig
@@ -0,0 +1,39 @@
+const std = @import("std");
+const print = std.debug.print;
+
+const day01 = @import("src/day01.zig");
+const day02 = @import("src/day02.zig");
+
+const Day = enum { day01, day02 };
+
+pub fn main() !void {
+    if (std.os.argv.len != 3) {
+        print("Usage: {s} <day> <part> < <input> \n", .{std.os.argv[0]});
+        return;
+    }
+
+    const stdin = std.io.getStdIn();
+
+    var gpa = std.heap.GeneralPurposeAllocator(.{}){};
+    const allocator = gpa.allocator();
+    defer {
+        _ = gpa.deinit();
+    }
+
+    const stat = try stdin.stat();
+    const buffer = try stdin.readToEndAlloc(allocator, stat.size);
+    defer allocator.free(buffer);
+
+    const args = try std.process.argsAlloc(allocator);
+    defer std.process.argsFree(allocator, args);
+
+    const day = std.meta.stringToEnum(Day, args[1]) orelse {
+        print("Not valid day or day not yet implemented\n: {s}", .{args[1]});
+        return;
+    };
+
+    try switch (day) {
+        .day01 => day01.solve(args[2], buffer, allocator),
+        .day02 => day02.solve(args[2], buffer),
+    };
+}
diff --git a/src/day01.zig b/src/day01.zig
new file mode 100644
index 0000000..33b0a67
--- /dev/null
+++ b/src/day01.zig
@@ -0,0 +1,81 @@
+const std = @import("std");
+const print = std.debug.print;
+
+pub fn solve(part: []u8, buffer: []u8, allocator: std.mem.Allocator) !void {
+    var lines = std.mem.splitScalar(u8, buffer, '\n');
+    var left = std.ArrayList(usize).init(allocator);
+    var right = std.ArrayList(usize).init(allocator);
+    defer left.deinit();
+    defer right.deinit();
+
+    if (std.mem.eql(u8, part, "part1")) {
+        try part1(&lines, &left, &right, allocator);
+    } else {
+        try part2(&lines, &left, &right, allocator);
+    }
+}
+
+fn part1(lines: *std.mem.SplitIterator(u8, .scalar), left: *std.ArrayList(usize), right: *std.ArrayList(usize), allocator: std.mem.Allocator) !void {
+    while (lines.next()) |line| {
+        if (line.len > 0) {
+            var components = std.mem.split(u8, line, "   ");
+            try left.append(try std.fmt.parseInt(usize, components.next().?, 10));
+            try right.append(try std.fmt.parseInt(usize, components.next().?, 10));
+        }
+    }
+
+    const left_s = try left.toOwnedSlice();
+    const right_s = try right.toOwnedSlice();
+    defer allocator.free(left_s);
+    defer allocator.free(right_s);
+
+    std.mem.sort(usize, left_s, {}, std.sort.asc(usize));
+    std.mem.sort(usize, right_s, {}, std.sort.asc(usize));
+
+    var sum: usize = 0;
+    for (left_s, right_s) |item_l, item_r| {
+        if (item_l > item_r) {
+            sum += item_l - item_r;
+        } else {
+            sum += item_r - item_l;
+        }
+    }
+
+    print("Sum is {d}\n", .{sum});
+}
+
+fn part2(lines: *std.mem.SplitIterator(u8, .scalar), left: *std.ArrayList(usize), right: *std.ArrayList(usize), allocator: std.mem.Allocator) !void {
+    while (lines.next()) |line| {
+        if (line.len > 0) {
+            var components = std.mem.split(u8, line, "   ");
+            try left.append(try std.fmt.parseInt(usize, components.next().?, 10));
+            try right.append(try std.fmt.parseInt(usize, components.next().?, 10));
+        }
+    }
+
+    const left_s = try left.toOwnedSlice();
+    const right_s = try right.toOwnedSlice();
+    defer allocator.free(left_s);
+    defer allocator.free(right_s);
+
+    std.mem.sort(usize, right_s, {}, std.sort.asc(usize));
+
+    var map = std.AutoHashMap(usize, usize).init(allocator);
+    defer map.deinit();
+
+    var sum: usize = 0;
+    for (left_s) |item_l| {
+        sum += map.get(item_l) orelse blk: {
+            var amount: usize = 0;
+            for (right_s) |item_r| {
+                if (item_l == item_r) {
+                    amount += item_l;
+                }
+            }
+            try map.put(item_l, amount);
+            break :blk amount;
+        };
+    }
+
+    print("Sum is {d}\n", .{sum});
+}
diff --git a/src/day02.zig b/src/day02.zig
new file mode 100644
index 0000000..cad2d9d
--- /dev/null
+++ b/src/day02.zig
@@ -0,0 +1,91 @@
+const std = @import("std");
+const stdin = std.io.getStdIn();
+const print = std.debug.print;
+
+pub fn solve(part: []u8, buffer: []u8) !void {
+    var lines = std.mem.splitScalar(u8, buffer, '\n');
+    if (std.mem.eql(u8, part, "part1")) {
+        try part1(&lines);
+    } else {
+        try part2(&lines);
+    }
+}
+
+fn part1(lines: *std.mem.SplitIterator(u8, .scalar)) !void {
+    var count: usize = 0;
+    lines: while (lines.next()) |line| {
+        if (line.len > 0) {
+            var components = std.mem.splitScalar(u8, line, ' ');
+            var previous: i32 = try std.fmt.parseInt(i32, components.next().?, 10);
+            var increasing: i32 = 0;
+            while (components.next()) |number_s| {
+                const number = try std.fmt.parseInt(i32, number_s, 10);
+                if (increasing == 0) {
+                    if (previous > number) {
+                        increasing = -1;
+                    } else {
+                        increasing = 1;
+                    }
+                }
+
+                const difference = (number - previous) * increasing;
+                if (difference < 1 or difference > 3) {
+                    continue :lines;
+                }
+                previous = number;
+            }
+            count += 1;
+        }
+    }
+
+    print("Safe count: {d}\n", .{count});
+}
+
+fn part2(lines: *std.mem.SplitIterator(u8, .scalar)) !void {
+    var count: usize = 0;
+    while (lines.next()) |line| {
+        if (line.len > 0) {
+            var components = std.mem.splitScalar(u8, line, ' ');
+
+            var i: usize = 0;
+            var j: usize = 0;
+
+            counter: while (i <= j) {
+                j = 0;
+                components.reset();
+
+                if (i == 0) {
+                    _ = components.next();
+                }
+
+                var previous: i32 = try std.fmt.parseInt(i32, components.next().?, 10);
+                var increasing: i32 = 0;
+                while (components.next()) |number_s| {
+                    if (i != j) {
+                        const number = try std.fmt.parseInt(i32, number_s, 10);
+                        if (increasing == 0) {
+                            if (previous > number) {
+                                increasing = -1;
+                            } else {
+                                increasing = 1;
+                            }
+                        }
+
+                        const difference = (number - previous) * increasing;
+                        if (difference < 1 or difference > 3) {
+                            i += 1;
+                            continue :counter;
+                        }
+                        previous = number;
+                    }
+
+                    j += 1;
+                }
+
+                count += 1;
+                break;
+            }
+        }
+    }
+    print("Safe count: {d}\n", .{count});
+}