anagram

rust/anagram/src/lib.rs

@@ -1,8 +1,36 @@
-use std::collections::HashSet;
+use std::collections::{HashMap, HashSet};
 
-pub fn anagrams_for<'a>(
-        word: &str, 
-        possible_anagrams: &[&str]
-    ) -> HashSet<&'a str> {
-    todo!("For the '{word}' word find anagrams among the following words: {possible_anagrams:?}");
+pub trait CharCounter {
+    fn get_chars_frequency(&self) -> HashMap<char, usize>;
+}
+
+pub trait AnagramsFinder<'a> {
+    fn find_anagrams(&self, pattern_raw: &str) -> HashSet<&'a str>;
+}
+
+impl CharCounter for str {
+    fn get_chars_frequency(&self) -> HashMap<char, usize> {
+        self.chars().fold(HashMap::new(), |mut acc, c| {
+            *acc.entry(c).or_insert(0) += 1;
+            acc
+        })
+    }
+}
+
+impl<'a> AnagramsFinder<'a> for [&'a str] {
+    fn find_anagrams(&self, pattern_raw: &str) -> HashSet<&'a str> {
+        let pattern = pattern_raw.to_lowercase();
+        let pattern_map: HashMap<char, usize> = pattern.get_chars_frequency();
+        self.iter()
+            .copied()
+            .filter(|word_raw| {
+                let word = word_raw.to_lowercase();
+                word != pattern && word.get_chars_frequency() == pattern_map
+            })
+            .collect()
+    }
+}
+
+pub fn anagrams_for<'a>(word: &str, possible_anagrams: &[&'a str]) -> HashSet<&'a str> {
+    possible_anagrams.find_anagrams(word)
 }

rust/anagram/tests/anagram.rs

@@ -11,7 +11,6 @@ fn no_matches() {
 }
 
 #[test]
-#[ignore]
 fn detects_two_anagrams() {
     let word = "solemn";
     let inputs = &["lemons", "cherry", "melons"];
@@ -21,7 +20,6 @@ fn detects_two_anagrams() {
 }
 
 #[test]
-#[ignore]
 fn does_not_detect_anagram_subsets() {
     let word = "good";
     let inputs = &["dog", "goody"];
@@ -31,7 +29,6 @@ fn does_not_detect_anagram_subsets() {
 }
 
 #[test]
-#[ignore]
 fn detects_anagram() {
     let word = "listen";
     let inputs = &["enlists", "google", "inlets", "banana"];
@@ -41,7 +38,6 @@ fn detects_anagram() {
 }
 
 #[test]
-#[ignore]
 fn detects_three_anagrams() {
     let word = "allergy";
     let inputs = &[
@@ -58,7 +54,6 @@ fn detects_three_anagrams() {
 }
 
 #[test]
-#[ignore]
 fn detects_multiple_anagrams_with_different_case() {
     let word = "nose";
     let inputs = &["Eons", "ONES"];
@@ -68,7 +63,6 @@ fn detects_multiple_anagrams_with_different_case() {
 }
 
 #[test]
-#[ignore]
 fn does_not_detect_non_anagrams_with_identical_checksum() {
     let word = "mass";
     let inputs = &["last"];
@@ -78,7 +72,6 @@ fn does_not_detect_non_anagrams_with_identical_checksum() {
 }
 
 #[test]
-#[ignore]
 fn detects_anagrams_case_insensitively() {
     let word = "Orchestra";
     let inputs = &["cashregister", "Carthorse", "radishes"];
@@ -88,7 +81,6 @@ fn detects_anagrams_case_insensitively() {
 }
 
 #[test]
-#[ignore]
 fn detects_anagrams_using_case_insensitive_subject() {
     let word = "Orchestra";
     let inputs = &["cashregister", "carthorse", "radishes"];
@@ -98,7 +90,6 @@ fn detects_anagrams_using_case_insensitive_subject() {
 }
 
 #[test]
-#[ignore]
 fn detects_anagrams_using_case_insensitive_possible_matches() {
     let word = "orchestra";
     let inputs = &["cashregister", "Carthorse", "radishes"];
@@ -108,7 +99,6 @@ fn detects_anagrams_using_case_insensitive_possible_matches() {
 }
 
 #[test]
-#[ignore]
 fn does_not_detect_an_anagram_if_the_original_word_is_repeated() {
     let word = "go";
     let inputs = &["goGoGO"];
@@ -118,7 +108,6 @@ fn does_not_detect_an_anagram_if_the_original_word_is_repeated() {
 }
 
 #[test]
-#[ignore]
 fn anagrams_must_use_all_letters_exactly_once() {
     let word = "tapper";
     let inputs = &["patter"];
@@ -128,7 +117,6 @@ fn anagrams_must_use_all_letters_exactly_once() {
 }
 
 #[test]
-#[ignore]
 fn words_are_not_anagrams_of_themselves() {
     let word = "BANANA";
     let inputs = &["BANANA"];
@@ -138,7 +126,6 @@ fn words_are_not_anagrams_of_themselves() {
 }
 
 #[test]
-#[ignore]
 fn words_are_not_anagrams_of_themselves_even_if_letter_case_is_partially_different() {
     let word = "BANANA";
     let inputs = &["Banana"];
@@ -148,7 +135,6 @@ fn words_are_not_anagrams_of_themselves_even_if_letter_case_is_partially_differe
 }
 
 #[test]
-#[ignore]
 fn words_are_not_anagrams_of_themselves_even_if_letter_case_is_completely_different() {
     let word = "BANANA";
     let inputs = &["banana"];
@@ -158,7 +144,6 @@ fn words_are_not_anagrams_of_themselves_even_if_letter_case_is_completely_differ
 }
 
 #[test]
-#[ignore]
 fn words_other_than_themselves_can_be_anagrams() {
     let word = "LISTEN";
     let inputs = &["LISTEN", "Silent"];
@@ -168,7 +153,6 @@ fn words_other_than_themselves_can_be_anagrams() {
 }
 
 #[test]
-#[ignore]
 fn handles_case_of_greek_letters() {
     let word = "ΑΒΓ";
     let inputs = &["ΒΓΑ", "ΒΓΔ", "γβα", "αβγ"];
@@ -178,7 +162,6 @@ fn handles_case_of_greek_letters() {
 }
 
 #[test]
-#[ignore]
 fn different_characters_may_have_the_same_bytes() {
     let word = "a⬂";
     let inputs = &["€a"];

rust/parallel-letter-frequency/src/lib.rs

@@ -11,7 +11,7 @@ pub fn frequency(input: &[&str], worker_count: usize) -> HashMap<char, usize> {
 
     thread::scope(|s| {
         let chunk_size = input.len().div_ceil(worker_count);
-        let mut handles: Vec<_> = input
+        let handles: Vec<_> = input
             .chunks(chunk_size)
             .map(|chunk| {
                 s.spawn(move || {