1 files changed, 26 insertions, 0 deletions
diff --git a/2021/01/first.zig b/2021/01/first.zig
new file mode 100644
index 0000000..79dcc89
--- /dev/null
+++ b/2021/01/first.zig
@@ -0,0 +1,26 @@
+const std = @import("std");
+
+const example = @embedFile("example");
+const input = @embedFile("input");
+
+pub fn main() anyerror!void {
+    try std.testing.expectEqual(solve(example), 7);
+    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;
+    var prev: ?u64 = null;
+    while (it.next()) |value| {
+        const n = try std.fmt.parseInt(u64, value, 10);
+        if (prev) |p| {
+            if (p < n) {
+                tot += 1;
+            }
+        }
+        prev = n;
+    }
+    return tot;
+}