1 files changed, 43 insertions, 0 deletions
diff --git a/src/day-5/part-1.zig b/src/day-5/part-1.zig
new file mode 100644
index 0000000..20647d5
--- /dev/null
+++ b/src/day-5/part-1.zig
@@ -0,0 +1,43 @@
+const std = @import("std");
+
+const range = struct { low: u64, high: u64 };
+
+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 list = std.ArrayList(range).init(alloc);
+    defer list.deinit();
+
+    var buffer: [256]u8 = undefined;
+
+    var fresh: u64 = 0;
+
+    while(try reader.readUntilDelimiterOrEof(&buffer, '\n')) |line| {
+        if(line.len == 0) continue;
+
+        if(std.mem.indexOf(u8, line, "-")) |ind| {
+            const low: u64 = try std.fmt.parseInt(u64, line[0 .. ind], 10);
+            const high: u64 = try std.fmt.parseInt(u64, line[ind + 1 ..], 10);
+
+            try list.append(.{.high = high, .low = low});
+        } else {
+            const n: u64 = try std.fmt.parseInt(u64, line, 10);
+
+            for(list.items) |r| {
+                if(r.low <= n and n <= r.high){
+                    fresh += 1;
+                    break;
+                }
+            }
+        }
+    }
+
+    std.debug.print("{d}\n", .{fresh});
+}