Add problem 2287: Rearrange Characters to Make Target String

src/lib.rs

@@ -1695,6 +1695,7 @@ pub mod problem_2280_minimum_lines_to_represent_a_line_chart;
 pub mod problem_2283_check_if_number_has_equal_digit_count_and_digit_value;
 pub mod problem_2284_sender_with_largest_word_count;
 pub mod problem_2285_maximum_total_importance_of_roads;
+pub mod problem_2287_rearrange_characters_to_make_target_string;
 
 #[cfg(test)]
 mod test_utilities;

src/problem_2287_rearrange_characters_to_make_target_string/iterative.rs

@@ -0,0 +1,47 @@
+pub struct Solution;
+
+// ------------------------------------------------------ snip ------------------------------------------------------ //
+
+use std::num::NonZeroU8;
+
+impl Solution {
+    pub fn rearrange_characters(s: String, target: String) -> i32 {
+        let mut s_counts = [0_u8; 26];
+
+        for c in s.into_bytes() {
+            s_counts[usize::from(c) - usize::from(b'a')] += 1;
+        }
+
+        let mut target_counts = [0_u8; 26];
+
+        for c in target.into_bytes() {
+            target_counts[usize::from(c) - usize::from(b'a')] += 1;
+        }
+
+        let mut result = u8::MAX;
+
+        for (&c_count, &target_count) in s_counts.iter().zip(&target_counts) {
+            if let Some(target_count) = NonZeroU8::new(target_count) {
+                result = result.min(c_count / target_count);
+            }
+        }
+
+        i32::from(result)
+    }
+}
+
+// ------------------------------------------------------ snip ------------------------------------------------------ //
+
+impl super::Solution for Solution {
+    fn rearrange_characters(s: String, target: String) -> i32 {
+        Self::rearrange_characters(s, target)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    #[test]
+    fn test_solution() {
+        super::super::tests::run::<super::Solution>();
+    }
+}

src/problem_2287_rearrange_characters_to_make_target_string/mod.rs

@@ -0,0 +1,22 @@
+pub mod iterative;
+
+pub trait Solution {
+    fn rearrange_characters(s: String, target: String) -> i32;
+}
+
+#[cfg(test)]
+mod tests {
+    use super::Solution;
+
+    pub fn run<S: Solution>() {
+        let test_cases = [
+            (("ilovecodingonleetcode", "code"), 2),
+            (("abcba", "abc"), 1),
+            (("abbaccaddaeea", "aaaaa"), 1),
+        ];
+
+        for ((s, target), expected) in test_cases {
+            assert_eq!(S::rearrange_characters(s.to_string(), target.to_string()), expected);
+        }
+    }
+}