diff --git a/graphs/possible_bipartition.py b/graphs/possible_bipartition.py
index ca55677..40ae503 100644
--- a/graphs/possible_bipartition.py
+++ b/graphs/possible_bipartition.py
@@ -8,5 +8,33 @@ def possible_bipartition(dislikes):
         Time Complexity: ?
         Space Complexity: ?
     """
-    pass
 
+    if not dislikes:
+        return True
+
+    first_dog = list(dislikes.keys())[0]
+
+    q = deque([first_dog])
+    v = []
+    safe_rooms = {}
+    for key in dislikes.keys():
+        safe_rooms[key] = 0
+
+    safe_rooms[first_dog] = 1
+
+    for dog in dislikes:
+        while q:
+            current = q.popleft()
+            v.append(current)
+            if dislikes[current]:
+                for rival in dislikes[current]:
+                    if safe_rooms[rival] == 0:
+                        safe_rooms[rival] = safe_rooms[current] + 1
+                        q.append(rival)
+                    else:
+                        if safe_rooms[rival] == safe_rooms[current]:
+                            return False
+        if dog not in v:
+            q.append(dog)
+
+    return True
diff --git a/requirements.txt b/requirements.txt
index 77ffa3f..fd9117f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,8 +1,8 @@
-attrs==20.3.0
-iniconfig==1.1.1
-packaging==20.8
-pluggy==0.13.1
-py==1.10.0
-pyparsing==2.4.7
-pytest==6.2.1
-toml==0.10.2
+attrs
+iniconfiG
+packaging
+pluggy
+py
+pyparsing
+pytest
+toml