solve up to day 7

1 files changed, 83 insertions, 0 deletions

diff --git a/src/day03.zig b/src/day03.zig
new file mode 100644
index 0000000..c91e60a
--- /dev/null
+++ b/src/day03.zig
@@ -0,0 +1,83 @@
+const std = @import("std");
+const print = std.debug.print;
+
+pub fn solve(part: []u8, reader: *std.Io.Reader, _: std.mem.Allocator) !void {
+    if (std.mem.eql(u8, part, "1")) {
+        try part1(reader);
+    } else {
+        try part2(reader);
+    }
+}
+
+
+fn part1(reader: *std.Io.Reader) !void {
+    var output: usize = 0;
+    while (reader.takeDelimiter('\n')) |line| {
+        if (line.?.len == 0){
+            break;
+        }
+
+        var max1: usize = 0;
+        var in1: usize = 0;
+        var max2: usize = 0;
+
+        for (line.?, 0..) |b, index| {
+            const value: u8 = b - '0';
+            if (value > max1) {
+                max2 = max1;
+                max1 = value;
+                in1 = index;
+            } else if (value > max2) {
+                max2 = value;
+            }
+        }
+
+        if (in1 < line.?.len - 1){
+            max2 = 0;
+            for (line.?[in1 + 1..]) |b| {
+                const value: u8 = b - '0';
+                if (value > max2) {
+                    max2 = value;
+                }
+            }
+            output += max1 * 10 + max2;
+        } else {
+            output += max2 * 10 + max1;
+        }
+
+    } else |_| {
+    }
+    print("{d}\n", .{output});
+}
+
+fn part2(reader: *std.Io.Reader) !void {
+    var output: usize = 0;
+    while (reader.takeDelimiter('\n')) |line| {
+        var joltage: usize = 0;
+        if (line.?.len == 0){
+            break;
+        }
+
+
+        var last_index: usize = 0;
+        for (0..12) |i| {
+            var max: usize = 0;
+            var max_index: usize = 0;
+            for (line.?[last_index .. line.?.len - 11 + i], 0..) |b, index| {
+                const value: u8 = b - '0';
+                if (value > max) {
+                    max = value;
+                    max_index = index;
+                }
+            }
+
+            last_index += max_index + 1;
+            joltage *= 10;
+            joltage += max;
+        }
+        output += joltage;
+
+    } else |_| {
+    }
+    print("{d}\n", .{output});
+}