add day 2

1 files changed, 17 insertions, 0 deletions

diff --git a/day-2/util/mem.zig b/day-2/util/mem.zig
new file mode 100644
index 0000000..89ba67b
--- /dev/null
+++ b/day-2/util/mem.zig
@@ -0,0 +1,17 @@
+const std = @import("std");
+const math = std.math;
+
+/// Returns the position of the smallest number in a slice.
+pub fn min_idx(comptime T: type, slice: []const T) usize {
+    var best = slice[0];
+    var idx: usize = 0;
+
+    for (slice[1..]) |item, i| {
+        const possible_best = math.min(best, item);
+        if (best > possible_best) {
+            best = possible_best;
+            idx = i + 1;
+        }
+    }
+    return idx;
+}