diff --git a/minimum-changes-on-bipartite-coloring/sol-cpy-ac/main.py b/minimum-changes-on-bipartite-coloring/sol-cpy-ac/main.py
index d01e86c..a0c1954 100644
--- a/minimum-changes-on-bipartite-coloring/sol-cpy-ac/main.py
+++ b/minimum-changes-on-bipartite-coloring/sol-cpy-ac/main.py
@@ -1,7 +1,76 @@
 #!/usr/bin/python3
 
 from sys import stdin
-from atcoder.dsu import DSU
+
+import typing
+
+
+# ac-library python
+class DSU:
+    """
+    Implement (union by size) + (path halving)
+
+    Reference:
+    Zvi Galil and Giuseppe F. Italiano,
+    Data structures and algorithms for disjoint set union problems
+    """
+
+    def __init__(self, n: int = 0) -> None:
+        self._n = n
+        self.parent_or_size = [-1] * n
+
+    def merge(self, a: int, b: int) -> int:
+        assert 0 <= a < self._n
+        assert 0 <= b < self._n
+
+        x = self.leader(a)
+        y = self.leader(b)
+
+        if x == y:
+            return x
+
+        if -self.parent_or_size[x] < -self.parent_or_size[y]:
+            x, y = y, x
+
+        self.parent_or_size[x] += self.parent_or_size[y]
+        self.parent_or_size[y] = x
+
+        return x
+
+    def same(self, a: int, b: int) -> bool:
+        assert 0 <= a < self._n
+        assert 0 <= b < self._n
+
+        return self.leader(a) == self.leader(b)
+
+    def leader(self, a: int) -> int:
+        assert 0 <= a < self._n
+
+        parent = self.parent_or_size[a]
+        while parent >= 0:
+            if self.parent_or_size[parent] < 0:
+                return parent
+            self.parent_or_size[a], a, parent = (
+                self.parent_or_size[parent],
+                self.parent_or_size[parent],
+                self.parent_or_size[self.parent_or_size[parent]],
+            )
+
+        return a
+
+    def size(self, a: int) -> int:
+        assert 0 <= a < self._n
+
+        return -self.parent_or_size[self.leader(a)]
+
+    def groups(self) -> typing.List[typing.List[int]]:
+        leader_buf = [self.leader(i) for i in range(self._n)]
+
+        result: typing.List[typing.List[int]] = [[] for _ in range(self._n)]
+        for i in range(self._n):
+            result[leader_buf[i]].append(i)
+
+        return list(filter(lambda r: r, result))
 
 
 def main():
diff --git a/minimum-changes-on-bipartite-coloring/sol-pypy-ac/main.py b/minimum-changes-on-bipartite-coloring/sol-pypy-ac/main.py
index d7708d8..dc98bba 100644
--- a/minimum-changes-on-bipartite-coloring/sol-pypy-ac/main.py
+++ b/minimum-changes-on-bipartite-coloring/sol-pypy-ac/main.py
@@ -1,7 +1,76 @@
 #!/usr/bin/env pypy
 
 from sys import stdin
-from atcoder.dsu import DSU
+
+import typing
+
+
+# ac-library python
+class DSU:
+    """
+    Implement (union by size) + (path halving)
+
+    Reference:
+    Zvi Galil and Giuseppe F. Italiano,
+    Data structures and algorithms for disjoint set union problems
+    """
+
+    def __init__(self, n: int = 0) -> None:
+        self._n = n
+        self.parent_or_size = [-1] * n
+
+    def merge(self, a: int, b: int) -> int:
+        assert 0 <= a < self._n
+        assert 0 <= b < self._n
+
+        x = self.leader(a)
+        y = self.leader(b)
+
+        if x == y:
+            return x
+
+        if -self.parent_or_size[x] < -self.parent_or_size[y]:
+            x, y = y, x
+
+        self.parent_or_size[x] += self.parent_or_size[y]
+        self.parent_or_size[y] = x
+
+        return x
+
+    def same(self, a: int, b: int) -> bool:
+        assert 0 <= a < self._n
+        assert 0 <= b < self._n
+
+        return self.leader(a) == self.leader(b)
+
+    def leader(self, a: int) -> int:
+        assert 0 <= a < self._n
+
+        parent = self.parent_or_size[a]
+        while parent >= 0:
+            if self.parent_or_size[parent] < 0:
+                return parent
+            self.parent_or_size[a], a, parent = (
+                self.parent_or_size[parent],
+                self.parent_or_size[parent],
+                self.parent_or_size[self.parent_or_size[parent]],
+            )
+
+        return a
+
+    def size(self, a: int) -> int:
+        assert 0 <= a < self._n
+
+        return -self.parent_or_size[self.leader(a)]
+
+    def groups(self) -> typing.List[typing.List[int]]:
+        leader_buf = [self.leader(i) for i in range(self._n)]
+
+        result: typing.List[typing.List[int]] = [[] for _ in range(self._n)]
+        for i in range(self._n):
+            result[leader_buf[i]].append(i)
+
+        return list(filter(lambda r: r, result))
 
 
 def main():
diff --git a/requirements.lock b/requirements.lock
index 48eb0f0..7511c4f 100644
--- a/requirements.lock
+++ b/requirements.lock
@@ -1,4 +1,3 @@
-ac-library-python==0.0.1
 bitarray==2.9.2
 certifi==2024.2.2
 charset-normalizer==3.3.2
diff --git a/requirements.txt b/requirements.txt
index 6976cf5..1c489a3 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,4 @@
 rime~=2.1.0
-git+https://github.com/not522/ac-library-python
 numpy
 scipy
 networkx