diff --git a/epi_judge_cpp_solutions/levenshtein_distance.cc b/epi_judge_cpp_solutions/levenshtein_distance.cc
index d30535c2e..09cef29db 100644
--- a/epi_judge_cpp_solutions/levenshtein_distance.cc
+++ b/epi_judge_cpp_solutions/levenshtein_distance.cc
@@ -42,9 +42,9 @@ int ComputeDistanceBetweenPrefixes(
       int substitute_last = ComputeDistanceBetweenPrefixes(
           A, A_idx - 1, B, B_idx - 1, distance_between_prefixes_ptr);
       int add_last = ComputeDistanceBetweenPrefixes(
-          A, A_idx - 1, B, B_idx, distance_between_prefixes_ptr);
-      int delete_last = ComputeDistanceBetweenPrefixes(
           A, A_idx, B, B_idx - 1, distance_between_prefixes_ptr);
+      int delete_last = ComputeDistanceBetweenPrefixes(
+          A, A_idx - 1, B, B_idx, distance_between_prefixes_ptr);
       distance_between_prefixes[A_idx][B_idx] =
           1 + min({substitute_last, add_last, delete_last});
     }
diff --git a/epi_judge_python_solutions/levenshtein_distance.py b/epi_judge_python_solutions/levenshtein_distance.py
index dbc76c1d7..16534314b 100644
--- a/epi_judge_python_solutions/levenshtein_distance.py
+++ b/epi_judge_python_solutions/levenshtein_distance.py
@@ -18,8 +18,8 @@ def compute_distance_between_prefixes(A_idx, B_idx):
 
         substitute_last = compute_distance_between_prefixes(
             A_idx - 1, B_idx - 1)
-        add_last = compute_distance_between_prefixes(A_idx - 1, B_idx)
-        delete_last = compute_distance_between_prefixes(A_idx, B_idx - 1)
+        add_last = compute_distance_between_prefixes(A_idx, B_idx - 1)
+        delete_last = compute_distance_between_prefixes(A_idx - 1, B_idx)
         return 1 + min(substitute_last, add_last, delete_last)
 
     return compute_distance_between_prefixes(len(A) - 1, len(B) - 1)