Fix TheAlgorithms#13226: consistent error handling for missing values

Author: rahini

coordinate_compression.py

@@ -0,0 +1,9 @@
+def compress(value):
+    if value not in coordinate_map:
+        raise ValueError(f"{value} not found in coordinate map")
+    return coordinate_map[value]
+
+def decompress(index):
+    if index < 0 or index >= len(original_values):
+        raise ValueError(f"Index {index} is out of bounds")
+    return original_values[index]