Commit 679aed4
Changed files (20)
2021/input/01-e2i.txt
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2021/input/02-p1s.txt
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2021/zig/00.zig → 2021/zig/01-p1s.zig
File renamed without changes
2021/zig/01-p2s.zig
@@ -0,0 +1,44 @@
+const std = @import("std");
+const io = std.io;
+const fmt = std.fmt;
+
+pub fn main() !void {
+ const allocator = std.heap.page_allocator;
+
+ // Read from stdin, line by line, into ArrayList of u16s
+ var buf: [1024]u8 = undefined;
+ const stdin = io.getStdIn().reader();
+ var depthReport = std.ArrayList(u16).init(allocator);
+ defer depthReport.deinit();
+ while (try stdin.readUntilDelimiterOrEof(&buf, '\n')) |line| {
+ const depth = fmt.parseUnsigned(u16, line, 10) catch {
+ std.debug.print("PARSE ERR: {s}\n", .{line});
+ continue;
+ };
+ try depthReport.append(depth);
+ }
+
+ // Create derivative 3 sweep array
+ var depth3 = std.ArrayList(u16).init(allocator);
+ defer depth3.deinit();
+ const dR = depthReport.items;
+ for (dR) |_,i| {
+ if (i > 1) {
+ const sweep = dR[i-2] + dR[i-1] + dR[i];
+ try depth3.append(sweep);
+ }
+ }
+
+ // Count number of increases in depth3 list
+ var inc: u16 = 0;
+ const d3 = depth3.items;
+ for (d3) |d,i| {
+ if (i > 0) {
+ const prev = d3[i-1];
+ if (prev < d){
+ inc += 1;
+ }
+ }
+ }
+ std.debug.print("{d}\n", .{inc});
+}
2021/zig/02-p1s.zig
@@ -0,0 +1,65 @@
+const std = @import("std");
+const io = std.io;
+const fmt = std.fmt;
+
+const Vector = enum { forward, up, down };
+
+// Submarine Commands
+const Command = struct {
+ vector: Vector,
+ thrust: u8,
+};
+
+const Coordinate = struct {
+ depth: u16,
+ forward: u16,
+};
+
+pub fn main() !void {
+ const stdin = io.getStdIn().reader();
+ const allocator = std.heap.page_allocator;
+
+ // Read from stdin, line by line
+ // split on " ", parse, and
+ // insert into ArrayList of Commands
+ var buf: [128]u8 = undefined;
+ var course = std.ArrayList(Command).init(allocator);
+ defer course.deinit();
+ while (try stdin.readUntilDelimiterOrEof(&buf, '\n')) |line| {
+ var line_parts = std.mem.split(u8, line, " ");
+ var c = Command{
+ .vector = undefined,
+ .thrust = undefined,
+ };
+ const raw_vector = line_parts.first();
+ if (std.mem.eql(u8, raw_vector, "forward")) {
+ c.vector = Vector.forward;
+ } else if (std.mem.eql(u8, raw_vector, "up")) {
+ c.vector = Vector.up;
+ } else if (std.mem.eql(u8, raw_vector, "down")) {
+ c.vector = Vector.down;
+ }
+ var raw_thrust = line_parts.next().?;
+ c.thrust = fmt.parseUnsigned(u8, raw_thrust, 10) catch |err| {
+ std.debug.print("PARSE ERR: {} {s}\n", .{ err, raw_thrust });
+ continue;
+ };
+
+ try course.append(c);
+ //std.debug.print("{}\n", .{c});
+ }
+ var p = Coordinate{
+ .depth = 0,
+ .forward = 0,
+ };
+ const cmds = course.items;
+ for (cmds) |c| {
+ p = switch (c.vector) {
+ .forward => Coordinate{ .depth = p.depth, .forward = p.forward + c.thrust },
+ .up => Coordinate{ .depth = p.depth - c.thrust, .forward = p.forward },
+ .down => Coordinate{ .depth = p.depth + c.thrust, .forward = p.forward },
+ };
+ }
+ const ans: u32 = @as(u32, p.depth) * p.forward;
+ std.debug.print("{}, {d}\n", .{ p, ans });
+}
2021/zig/02-p2s.zig
@@ -0,0 +1,85 @@
+const std = @import("std");
+const io = std.io;
+const fmt = std.fmt;
+
+const Vector = enum { forward, up, down };
+
+// Submarine Commands
+const Command = struct {
+ vector: Vector,
+ thrust: u8,
+};
+
+const Coordinate = struct {
+ aim: u16,
+ depth: u32,
+ forward: u16,
+};
+
+pub fn main() !void {
+ const stdin = io.getStdIn().reader();
+ const allocator = std.heap.page_allocator;
+
+ // Read from stdin, line by line
+ // split on " ", parse, and
+ // insert into ArrayList of Commands
+ var buf: [128]u8 = undefined;
+ var course = std.ArrayList(Command).init(allocator);
+ defer course.deinit();
+ while (try stdin.readUntilDelimiterOrEof(&buf, '\n')) |line| {
+ var line_parts = std.mem.split(u8, line, " ");
+ var c = Command{
+ .vector = undefined,
+ .thrust = undefined,
+ };
+ const raw_vector = line_parts.first();
+ if (std.mem.eql(u8, raw_vector, "forward")) {
+ c.vector = Vector.forward;
+ } else if (std.mem.eql(u8, raw_vector, "up")) {
+ c.vector = Vector.up;
+ } else if (std.mem.eql(u8, raw_vector, "down")) {
+ c.vector = Vector.down;
+ }
+ var raw_thrust = line_parts.next().?;
+ c.thrust = fmt.parseUnsigned(u8, raw_thrust, 10) catch |err| {
+ std.debug.print("PARSE ERR: {} {s}\n", .{ err, raw_thrust });
+ continue;
+ };
+
+ try course.append(c);
+ //std.debug.print("{}\n", .{c});
+ }
+ var p = Coordinate{
+ .aim = 0,
+ .depth = 0,
+ .forward = 0,
+ };
+ const cmds = course.items;
+ for (cmds) |c| {
+ p = switch (c.vector) {
+ .down => Coordinate{
+ .aim = p.aim + c.thrust,
+ .depth = p.depth,
+ .forward = p.forward,
+ },
+ .up => Coordinate{
+ .aim = p.aim - c.thrust,
+ .depth = p.depth,
+ .forward = p.forward,
+ },
+ .forward => blk: {
+ var depth_delta: u16 = 0;
+ if (@mulWithOverflow(u16, c.thrust, p.aim, &depth_delta)){
+ return error.Overflow;
+ }
+ break :blk Coordinate{
+ .aim = p.aim,
+ .depth = p.depth + depth_delta,
+ .forward = p.forward + c.thrust,
+ };
+ },
+ };
+ }
+ const ans: u32 = @as(u32, p.depth) * p.forward;
+ std.debug.print("{}, {d}\n", .{ p, ans });
+}
2021/zig/03-p1s.zig
@@ -0,0 +1,59 @@
+const std = @import("std");
+const io = std.io;
+const fmt = std.fmt;
+
+const BitCount = struct {
+ zeros: u16,
+ ones: u16,
+};
+
+const rll = 12;
+
+pub fn main() !void {
+ const stdin = io.getStdIn().reader();
+
+ var buf: [128]u8 = undefined;
+ var sum: [rll]BitCount = undefined;
+ for (sum) |_,i| {
+ sum[i] = BitCount{
+ .zeros = 0,
+ .ones = 0,
+ };
+ }
+
+ // Read from stdin, line by line
+ // TODO: sense rll to work with example or source input
+ while (try stdin.readUntilDelimiterOrEof(&buf, '\n')) |line| {
+ for (line) |char, i| {
+ if (char == '1') {
+ sum[i].ones += 1;
+ } else if (char == '0') {
+ sum[i].zeros += 1;
+ } else {
+ std.debug.print("PARSING ERROR: 0x{d}", .{char});
+ }
+ }
+ }
+ var gamma_binary: [rll]u8 = undefined;
+ var epsilon_binary: [rll]u8 = undefined;
+ for (sum) |_,i| {
+ if (sum[i].zeros > sum[i].ones){
+ gamma_binary[i] = '0';
+ epsilon_binary[i] = '1';
+ } else {
+ gamma_binary[i] = '1';
+ epsilon_binary[i] = '0';
+ }
+ }
+ const gamma = fmt.parseUnsigned(u32, gamma_binary[0..gamma_binary.len], 2) catch |err| {
+ std.debug.print("PARSE ERR: {} {s}\n", .{ err, gamma_binary });
+ return err;
+ };
+ const epsilon = fmt.parseUnsigned(u32, epsilon_binary[0..epsilon_binary.len], 2) catch |err| {
+ std.debug.print("PARSE ERR: {} {s}\n", .{ err, gamma_binary });
+ return err;
+ };
+ std.debug.print("gamma: 0b{s} {d}\n", .{gamma_binary, gamma});
+ std.debug.print("epsilon: 0b{s} {d}\n", .{epsilon_binary, epsilon});
+ std.debug.print("power: {d}\n", .{epsilon * gamma});
+}