Prolog solutions

3 files changed, 50 insertions, 0 deletions

diff --git a/challenge-320/adam-russell/blog1.txt b/challenge-320/adam-russell/blog1.txt
new file mode 100644
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+++ b/challenge-320/adam-russell/blog1.txt
@@ -0,0 +1 @@
+http://rabbitfarm.com/cgi-bin/blosxom/prolog/2025/05/11
diff --git a/challenge-320/adam-russell/prolog/ch-1.p b/challenge-320/adam-russell/prolog/ch-1.p
new file mode 100644
index 0000000000..f8aa1b85c0
--- /dev/null
+++ b/challenge-320/adam-russell/prolog/ch-1.p
@@ -0,0 +1,27 @@
+
+  
+  identify_negatives(Number, 1):-
+      Number < 0.
+  identify_negatives(_, 0).
+
+  
+  identify_positives(Number, 1):-
+      Number > 0.
+  identify_positives(_, 0).
+
+  
+  count_negatives(Numbers, Count):-
+      maplist(identify_negatives, Numbers, Negatives),
+      sum_list(Negatives, Count).
+
+  
+  count_positives(Numbers, Count):-
+      maplist(identify_positives, Numbers, Positives),
+      sum_list(Positives, Count).
+
+  
+  maximum_count(Numbers, MaximumCount):-
+      count_negatives(Numbers, NegativesCount),
+      count_positives(Numbers, PositivesCount),
+      max_list([NegativesCount, PositivesCount], MaximumCount).
+
diff --git a/challenge-320/adam-russell/prolog/ch-2.p b/challenge-320/adam-russell/prolog/ch-2.p
new file mode 100644
index 0000000000..6e4b4d0f16
--- /dev/null
+++ b/challenge-320/adam-russell/prolog/ch-2.p
@@ -0,0 +1,22 @@
+
+  
+  char_number(C, N):-
+      number_chars(N, [C]).
+
+  
+  element_sum(Numbers, ElementSum):-
+      sum_list(Numbers, ElementSum).
+
+  
+  digit_sum(Numbers, DigitSum):-
+  maplist(number_chars, Numbers, Characters),
+  flatten(Characters, CharactersFlattened),
+  maplist(char_number, CharactersFlattened, Digits),
+  sum_list(Digits, DigitSum).
+
+  
+  sum_differences(Numbers, Differences):-
+      element_sum(Numbers, ElementSum),
+      digit_sum(Numbers, DigitSum),  
+      Differences is abs(DigitSum - ElementSum).
+