aoc2022/day2/puzzle1.zig

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

        total_points += switch (op - me) {
            -1, 2 => 6,
            -2, 1 => 0,
            else => 3,
        };

        total_points += @intCast(u4, me);
    }
    print("{}\n", .{total_points});
}