2022-03 in zig

1 files changed, 43 insertions, 0 deletions

diff --git a/2022/03-rucksack-reorganization/second.zig b/2022/03-rucksack-reorganization/second.zig
new file mode 100644
index 0000000..25375bf
--- /dev/null
+++ b/2022/03-rucksack-reorganization/second.zig
@@ -0,0 +1,43 @@
+const std = @import("std");
+
+const example = @embedFile("example");
+const input = @embedFile("input");
+
+pub fn main() anyerror!void {
+    try std.testing.expectEqual(solve(example), 70);
+    const result = try solve(input);
+    try std.io.getStdOut().writer().print("{}\n", .{result});
+}
+
+fn solve(puzzle: []const u8) !u64 {
+    var it = std.mem.tokenize(u8, puzzle, "\n");
+    var tot: u64 = 0;
+    while (it.next()) |line1| {
+        if (it.next()) |line2| {
+            if (it.next()) |line3| {
+                var i: usize = 0;
+                outer: while (i < line1.len) : (i += 1) {
+                    var j: usize = 0;
+                    while (j < line2.len) : (j += 1) {
+                        if (line1[i] == line2[j]) {
+                            var k: usize = 0;
+                            while (k < line3.len) : (k += 1) {
+                                if (line1[i] == line3[k]) {
+                                    break :outer;
+                                }
+                            }
+                            continue :outer; // char on line1 was not found in line3
+                        }
+                    }
+                    continue :outer; // char on line1 was not found in line2
+                }
+                if (line1[i] <= 'Z') {
+                    tot = tot + line1[i] - 'A' + 27;
+                } else {
+                    tot = tot + line1[i] - 'a' + 1;
+                }
+            }
+        }
+    }
+    return tot;
+}