Fix

Author: Alvi24-hub

games/Number-Sliding-Puzzle/Number-Sliding-Puzzle.py

@@ -11,21 +11,25 @@
 def is_solvable(numbers):
     """
     Determines if the 8-puzzle board configuration is solvable.
-    An 8-puzzle (3x3 grid) is solvable if the number of inversions is even.
-    The blank tile (0) is ignored when counting inversions. 
+    For a 3x3 puzzle, the state is solvable if and only if
+    (inversions + blank_row_from_bottom) is odd.
+    The blank tile (0) is ignored when counting inversions.
     """
-    # Filter out the blank tile(0)
-
+    # Filter out the blank tile (0) for inversion counting
     tiles = [n for n in numbers if n != 0]
     inversions = 0
     for i in range(len(tiles)):
         for j in range(i + 1, len(tiles)):
             if tiles[i] > tiles[j]:
                 inversions += 1
 
-    # return True if inversions count is even, False otherwise
+    # Find blank tile row from the bottom (1=bottom, 2=middle, 3=top)
+    blank_idx = numbers.index(0)
+    blank_row_from_top = blank_idx // 3  # 0=top, 1=middle, 2=bottom
+    blank_row_from_bottom = 3 - blank_row_from_top
 
-    return inversions % 2 == 0
+    # Solvable if (inversions + blank_row_from_bottom) is odd
+    return (inversions + blank_row_from_bottom) % 2 == 1
 
 
 def main():

math/Collatz-Conjecture/Collatz-Conjecture.py

@@ -23,11 +23,7 @@ def get_remaining_sequence(n: int) -> List[int]:
 def collatz_sequence(start: int) -> Generator[int, None, None]:
     """Generate the Collatz sequence starting from the given number."""
     if start in steps_cache:
-        n = start
-        yield n
-        while n != 1:
-            n = collatz_next(n)
-            yield n
+        yield from get_remaining_sequence(start)
         return
 
     n = start

projects_registry.json

@@ -704,7 +704,7 @@
       "encryption",
       "vault"
     ],
-    "path": "security/password_manager/main.py"
+    "path": "security/password_manager/main.py",
     "name": "High-Performance Multithreaded Web Scraper",
     "emoji": "🕷️",
     "category": "utilities",

security/tar_safe.py

@@ -149,16 +149,6 @@ def _validate_member(
             raise UnsafeTarError(
                 f"Blocked file type for {member.name}: {member.type}"
             )
-        
-        if target_path.exists() and not overwrite:
-            raise UnsafeTarError(
-                f"File already exists and overwrite=False: {target_path}"
-            )
-        
-        if member.type in self.blocked_types:
-            raise UnsafeTarError(
-                f"Blocked file type for {member.name}: {member.type}"
-            )
 
     def _get_safe_path(self, member: tarfile.TarInfo, extract_path: Path) -> Path:
         """Get safe path for extraction."""

security/url_sanitizer.py

@@ -140,21 +140,6 @@ def _check_blocked_ip(self, ip, host):
                     if not (self.allow_private and ip.is_private):
                         raise InvalidURLError(f"Blocked IP address: {host}")
 
-    def _validate_port(self, port: Optional[int]) -> None:
-        """Validate port number against allowed/blocked lists."""
-        if port is None:
-            return
-        if port < 1 or port > 65535:
-            raise InvalidURLError(f"Invalid port number: {port}")
-        if self.allowed_ports is not None:
-            if port not in self.allowed_ports:
-                raise InvalidURLError(
-                    f"Port {port} is not allowed. "
-                    f"Allowed ports: {', '.join(str(p) for p in self.allowed_ports)}"
-                )
-        elif port in self.BLOCKED_PORTS:
-            raise InvalidURLError(f"Blocked port: {port}")
-    
     def _validate_port(self, port: Optional[int]) -> None:
         """Validate port number against allowed/blocked lists."""
         if port is None: