1 files changed, 39 insertions, 0 deletions
diff --git a/src/day-3/part-1.zig b/src/day-3/part-1.zig
new file mode 100644
index 0000000..2e0c1f6
--- /dev/null
+++ b/src/day-3/part-1.zig
@@ -0,0 +1,39 @@
+const std = @import("std");
+
+pub fn main() !void {
+    //var gpa = std.heap.GeneralPurposeAllocator(.{}){};
+    //defer gpa.deinit();
+    //const alloc = gpa.allocator();
+    
+    const path = "input.txt";
+    const fp = try std.fs.cwd().openFile(path, .{.mode = std.fs.File.OpenMode.read_only});
+    defer fp.close();
+    var reader = fp.reader();
+
+    var buffer: [256]u8 = undefined;
+
+    var total: u64 = 0;
+
+    while(try reader.readUntilDelimiterOrEof(&buffer, '\n')) |line| {
+        var ind1: usize = line.len - 2;
+
+        var i: usize = 2;
+        while(i <= line.len) : (i += 1) {
+            if(line[line.len - i] - '0' >= line[ind1] - '0'){
+                ind1 = line.len - i;
+            }
+        }
+
+        i = ind1 + 1;
+        var ind2: usize = ind1 + 1;
+        while(i < line.len) : (i += 1) {
+            if(line[i] - '0' > line[ind2] - '0'){
+                ind2 = i;
+            }
+        }
+
+        total += ((line[ind1] - '0') * 10) + line[ind2] - '0';
+    }
+
+    std.debug.print("{d}\n", .{total});
+}