Add problem 1844: Replace All Digits with Characters

src/lib.rs

@@ -1416,6 +1416,7 @@ pub mod problem_1832_check_if_the_sentence_is_pangram;
 pub mod problem_1833_maximum_ice_cream_bars;
 pub mod problem_1837_sum_of_digits_in_base_k;
 pub mod problem_1839_longest_substring_of_all_vowels_in_order;
+pub mod problem_1844_replace_all_digits_with_characters;
 
 #[cfg(test)]
 mod test_utilities;

src/problem_1844_replace_all_digits_with_characters/iterative.rs

@@ -0,0 +1,34 @@
+pub struct Solution;
+
+// ------------------------------------------------------ snip ------------------------------------------------------ //
+
+impl Solution {
+    pub fn replace_digits(s: String) -> String {
+        let mut s = s.into_bytes();
+        let mut i = 0;
+
+        while let Some([left, right]) = s.get_mut(i..i + 2) {
+            *right = *left + (*right - b'0');
+
+            i += 2;
+        }
+
+        String::from_utf8(s).unwrap()
+    }
+}
+
+// ------------------------------------------------------ snip ------------------------------------------------------ //
+
+impl super::Solution for Solution {
+    fn replace_digits(s: String) -> String {
+        Self::replace_digits(s)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    #[test]
+    fn test_solution() {
+        super::super::tests::run::<super::Solution>();
+    }
+}

src/problem_1844_replace_all_digits_with_characters/mod.rs

@@ -0,0 +1,18 @@
+pub mod iterative;
+
+pub trait Solution {
+    fn replace_digits(s: String) -> String;
+}
+
+#[cfg(test)]
+mod tests {
+    use super::Solution;
+
+    pub fn run<S: Solution>() {
+        let test_cases = [("a1c1e1", "abcdef"), ("a1b2c3d4e", "abbdcfdhe")];
+
+        for (s, expected) in test_cases {
+            assert_eq!(S::replace_digits(s.to_string()), expected);
+        }
+    }
+}