first commit

day1/puzzle1.zig

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+const std = @import("std");
+
+pub fn main() !void {
+    // read the input file
+    const input = try std.fs.cwd().openFile("input", .{});
+    defer input.close();
+
+    var buf_reader = std.io.bufferedReader(input.reader());
+    var in_stream = buf_reader.reader();
+    var buf: [1024]u8 = undefined;
+
+    var cal : i32 = 0;
+    var max_cal : i32 = 0;
+
+    while (try in_stream.readUntilDelimiterOrEof(&buf, '\n')) |line| {
+        for (line) |char| {
+            if (!std.ascii.isWhitespace(char)) { // Contains a number
+                const curr_cal = try std.fmt.parseInt(i32, line, 10);
+                cal += curr_cal;
+                break; // else branch not evaluated
+            }
+        } else { // All characters are whitelines
+            max_cal = @max(max_cal, cal);
+            cal = 0;
+        }
+    }
+
+    std.debug.print("Maximum Calories: {}\n", .{max_cal});
+
+
+
+}

day1/puzzle2.zig

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+const std = @import("std");
+
+pub fn main() !void {
+    // read the input file
+    const input = try std.fs.cwd().openFile("input", .{});
+    defer input.close();
+
+    var buf_reader = std.io.bufferedReader(input.reader());
+    var in_stream = buf_reader.reader();
+    var buf: [1024]u8 = undefined;
+
+    var cal : i32 = 0;
+    var max_cal : [3]i32 = .{0, 0, 0};
+
+    while (try in_stream.readUntilDelimiterOrEof(&buf, '\n')) |line| {
+        for (line) |char| {
+            if (!std.ascii.isWhitespace(char)) { // Contains a number
+                cal += std.fmt.parseInt(i32, line, 10) catch break;
+                break; // else branch not evaluated
+            }
+        } else { // All characters are whitelines
+            for (max_cal) |*max_i| {
+                if (cal > max_i.*) {
+                    const aux = max_i.*;
+                    max_i.* = cal;
+                    cal = aux;
+                }
+            }
+            cal = 0;
+        }
+    }
+
+    var max_total : i32 = 0;
+    for (max_cal) |max_i| {
+        std.debug.print("Max : {}\n", .{max_i});
+        max_total += max_i;
+    }
+
+    std.debug.print("Maximum Calories: {}\n", .{max_total});
+
+}

day2/puzzle1.zig

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+const std = @import("std");
+
+const mem = std.mem;
+const fmt = std.fmt;
+
+const print = std.debug.print;
+
+const input = @embedFile("input");
+
+pub fn main() !void {
+    var total_points: u32 = 0;
+    // Split the input
+    var input_iter = mem.split(u8, input, "\n");
+    while (input_iter.next()) |line| {
+        // Input ends with an empty line
+        if (line.len == 0) continue;
+        // Converting character code to points
+        const op: i4 = @intCast(i4, line[0] -| 64);
+        const me: i4 = @intCast(i4, line[2] -| 87);
+
+        //rock - paper = -1 WIN
+        //rock - scissors = -2 LOSE
+        //paper - rock = 1 LOSE
+        //paper - scissors = -1 WIN
+        //scissors - rock = 2 WIN
+        //scissors - paper = 1 LOSE
+
+        switch (op - me) {
+            -1, 2 => total_points += 6,
+            -2, 1 => total_points += 0,
+            else => total_points += 3,
+        }
+
+        total_points += @intCast(u4, me);
+    }
+    print("{}\n", .{total_points});
+}