1 files changed, 18 insertions, 0 deletions
diff --git a/lib/queue.h b/lib/queue.h
new file mode 100644
index 0000000..c7acec1
--- /dev/null
+++ b/lib/queue.h
@@ -0,0 +1,18 @@
+
+#pragma once
+
+#include <inttypes.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <string.h>
+
+typedef struct ll_tag {
+  uint32_t x;
+  struct ll_tag *next;
+} ll_t;
+
+void stack_push(ll_t **q, uint32_t x);
+
+uint32_t stack_pop(ll_t **q);
+
+bool stack_contains(const ll_t *q, uint32_t x);