1 files changed, 40 insertions, 0 deletions
diff --git a/src/set.c b/src/set.c
new file mode 100644
index 0000000..b84ae6a
--- /dev/null
+++ b/src/set.c
@@ -0,0 +1,40 @@
+#include <stdlib.h>
+
+#include "set.h"
+
+set *set_create()
+{
+    set *s = malloc(sizeof(set));
+    s->parent = s;
+    s->rank = 0;
+    return s;
+}
+
+void set_free(set *s)
+{
+    free(s);
+}
+
+set *set_find(set *s)
+{
+    if(s->parent == s)
+        return s;
+    s->parent = set_find(s->parent);
+    return s->parent;
+}
+
+void set_union(set *x, set *y)
+{
+    x = set_find(x);
+    y = set_find(y);
+
+    if(x == y) return;
+
+    if(x->rank > y->rank) {
+        y->parent = x;
+    } else {
+        x->parent = y;
+    }
+
+    if(x->rank == y->rank) x->rank++;
+}