[STAGING]

src/lib.rs

@@ -1799,6 +1799,14 @@ pub mod problem_2411_smallest_subarrays_with_maximum_bitwise_or;
 pub mod problem_2412_minimum_money_required_before_transactions;
 pub mod problem_2413_smallest_even_multiple;
 pub mod problem_2414_length_of_the_longest_alphabetical_continuous_substring;
+pub mod problem_2415_reverse_odd_levels_of_binary_tree;
+pub mod problem_2416_sum_of_prefix_scores_of_strings;
+pub mod problem_2418_sort_the_people;
+pub mod problem_2419_longest_subarray_with_maximum_bitwise_and;
+pub mod problem_2420_find_all_good_indices;
+pub mod problem_2421_number_of_good_paths;
+pub mod problem_2423_remove_letter_to_equalize_frequency;
+pub mod problem_2425_bitwise_xor_of_all_pairings;
 
 #[cfg(test)]
 mod test_utilities;

src/problem_2415_reverse_odd_levels_of_binary_tree/bfs.rs

@@ -0,0 +1,64 @@
+use crate::data_structures::TreeNode;
+
+pub struct Solution;
+
+// ------------------------------------------------------ snip ------------------------------------------------------ //
+
+use std::cell::RefCell;
+use std::collections::VecDeque;
+use std::mem;
+use std::rc::Rc;
+
+impl Solution {
+    pub fn reverse_odd_levels(root: Option<Rc<RefCell<TreeNode>>>) -> Option<Rc<RefCell<TreeNode>>> {
+        let mut queue = VecDeque::from([Rc::clone(root.as_ref().unwrap())]);
+
+        'outer: loop {
+            for _ in 0..queue.len() {
+                let node = queue.pop_front().unwrap();
+                let node = node.borrow();
+
+                if let (Some(left), Some(right)) = (&node.left, &node.right) {
+                    queue.extend([Rc::clone(left), Rc::clone(right)]);
+                } else {
+                    break 'outer;
+                }
+            }
+
+            let mut iter = queue.iter();
+
+            while let (Some(left), Some(right)) = (iter.next(), iter.next_back()) {
+                mem::swap(&mut left.borrow_mut().val, &mut right.borrow_mut().val);
+            }
+
+            for _ in 0..queue.len() {
+                let node = queue.pop_front().unwrap();
+                let node = node.borrow();
+
+                if let (Some(left), Some(right)) = (&node.left, &node.right) {
+                    queue.extend([Rc::clone(left), Rc::clone(right)]);
+                } else {
+                    break 'outer;
+                }
+            }
+        }
+
+        root
+    }
+}
+
+// ------------------------------------------------------ snip ------------------------------------------------------ //
+
+impl super::Solution for Solution {
+    fn reverse_odd_levels(root: Option<Rc<RefCell<TreeNode>>>) -> Option<Rc<RefCell<TreeNode>>> {
+        Self::reverse_odd_levels(root)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    #[test]
+    fn test_solution() {
+        super::super::tests::run::<super::Solution>();
+    }
+}

src/problem_2415_reverse_odd_levels_of_binary_tree/mod.rs

@@ -0,0 +1,33 @@
+use crate::data_structures::TreeNode;
+use std::cell::RefCell;
+use std::rc::Rc;
+
+pub mod bfs;
+
+pub trait Solution {
+    fn reverse_odd_levels(root: Option<Rc<RefCell<TreeNode>>>) -> Option<Rc<RefCell<TreeNode>>>;
+}
+
+#[cfg(test)]
+mod tests {
+    use super::Solution;
+    use crate::test_utilities;
+
+    pub fn run<S: Solution>() {
+        let test_cases = [
+            (&[2, 3, 5, 8, 13, 21, 34] as &[_], &[2, 5, 3, 8, 13, 21, 34] as &[_]),
+            (&[7, 13, 11], &[7, 11, 13]),
+            (
+                &[0, 1, 2, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2],
+                &[0, 2, 1, 0, 0, 0, 0, 2, 2, 2, 2, 1, 1, 1, 1],
+            ),
+        ];
+
+        for (root, expected) in test_cases {
+            assert_eq!(
+                S::reverse_odd_levels(test_utilities::make_tree(root.iter().copied().map(Some))),
+                test_utilities::make_tree(expected.iter().copied().map(Some)),
+            );
+        }
+    }
+}

src/problem_2416_sum_of_prefix_scores_of_strings/mod.rs

@@ -0,0 +1,24 @@
+pub mod trie;
+
+pub trait Solution {
+    fn sum_prefix_scores(words: Vec<String>) -> Vec<i32>;
+}
+
+#[cfg(test)]
+mod tests {
+    use super::Solution;
+
+    pub fn run<S: Solution>() {
+        let test_cases = [
+            (&["abc", "ab", "bc", "b"] as &[_], &[5, 4, 3, 2] as &[_]),
+            (&["abcd"], &[4]),
+        ];
+
+        for (words, expected) in test_cases {
+            assert_eq!(
+                S::sum_prefix_scores(words.iter().copied().map(str::to_string).collect()),
+                expected,
+            );
+        }
+    }
+}

src/problem_2416_sum_of_prefix_scores_of_strings/trie.rs

@@ -0,0 +1,74 @@
+pub struct Solution;
+
+// ------------------------------------------------------ snip ------------------------------------------------------ //
+
+struct Node {
+    count: u32,
+    children: [u32; 26],
+}
+
+impl Solution {
+    pub fn sum_prefix_scores(words: Vec<String>) -> Vec<i32> {
+        let mut allocator = Vec::<Node>::with_capacity(words.len() * 2);
+        let mut allocator_len = 0;
+        let mut root = [u32::MAX; 26];
+
+        for word in &words {
+            let mut node = &mut root;
+
+            for c in word.bytes() {
+                let c = usize::from(c - b'a');
+                let mut child_index = node[c] as usize;
+
+                if child_index < allocator_len {
+                    allocator[child_index].count += 1;
+                } else {
+                    node[c] = allocator_len as _;
+                    child_index = allocator_len;
+
+                    allocator.push(Node {
+                        count: 1,
+                        children: [u32::MAX; 26],
+                    });
+
+                    allocator_len += 1;
+                };
+
+                node = &mut allocator[child_index].children;
+            }
+        }
+
+        words
+            .into_iter()
+            .map(|word| {
+                let mut count = 0;
+                let mut node = &root;
+
+                for c in word.into_bytes() {
+                    let child = &allocator[node[usize::from(c) - usize::from(b'a')] as usize];
+
+                    count += child.count;
+                    node = &child.children;
+                }
+
+                count as _
+            })
+            .collect()
+    }
+}
+
+// ------------------------------------------------------ snip ------------------------------------------------------ //
+
+impl super::Solution for Solution {
+    fn sum_prefix_scores(words: Vec<String>) -> Vec<i32> {
+        Self::sum_prefix_scores(words)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    #[test]
+    fn test_solution() {
+        super::super::tests::run::<super::Solution>();
+    }
+}

src/problem_2418_sort_the_people/mod.rs

@@ -0,0 +1,27 @@
+pub mod sort_by_key;
+
+pub trait Solution {
+    fn sort_people(names: Vec<String>, heights: Vec<i32>) -> Vec<String>;
+}
+
+#[cfg(test)]
+mod tests {
+    use super::Solution;
+
+    pub fn run<S: Solution>() {
+        let test_cases = [
+            (
+                (&["Mary", "John", "Emma"] as &[_], &[180, 165, 170] as &[_]),
+                &["Mary", "Emma", "John"] as &[_],
+            ),
+            ((&["Alice", "Bob", "Bob"], &[155, 185, 150]), &["Bob", "Alice", "Bob"]),
+        ];
+
+        for ((names, heights), expected) in test_cases {
+            assert_eq!(
+                S::sort_people(names.iter().copied().map(str::to_string).collect(), heights.to_vec()),
+                expected,
+            );
+        }
+    }
+}

src/problem_2418_sort_the_people/sort_by_key.rs

@@ -0,0 +1,42 @@
+pub struct Solution;
+
+// ------------------------------------------------------ snip ------------------------------------------------------ //
+
+use std::cmp::Reverse;
+use std::mem;
+
+impl Solution {
+    pub fn sort_people(names: Vec<String>, heights: Vec<i32>) -> Vec<String> {
+        let mut names = names;
+
+        let mut sorting = names
+            .iter_mut()
+            .zip(heights)
+            .map(|(name, height)| (height, mem::take(name)))
+            .collect::<Vec<_>>();
+
+        sorting.sort_unstable_by_key(|&(height, _)| Reverse(height as u32));
+
+        for (target, (_, mut name)) in names.iter_mut().zip(sorting) {
+            mem::swap(target, &mut name);
+        }
+
+        names
+    }
+}
+
+// ------------------------------------------------------ snip ------------------------------------------------------ //
+
+impl super::Solution for Solution {
+    fn sort_people(names: Vec<String>, heights: Vec<i32>) -> Vec<String> {
+        Self::sort_people(names, heights)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    #[test]
+    fn test_solution() {
+        super::super::tests::run::<super::Solution>();
+    }
+}

src/problem_2419_longest_subarray_with_maximum_bitwise_and/iterative.rs

@@ -0,0 +1,71 @@
+pub struct Solution;
+
+// ------------------------------------------------------ snip ------------------------------------------------------ //
+
+use std::cmp::Ordering;
+
+impl Solution {
+    pub fn longest_subarray(nums: Vec<i32>) -> i32 {
+        let mut max_value = 0;
+        let mut max_value_length = 0;
+        let mut length = 0;
+        let mut iter = nums.iter().map(|&x| x as u32);
+
+        'outer: loop {
+            if let Some(num) = iter.next() {
+                match num.cmp(&max_value) {
+                    Ordering::Less => {
+                        max_value_length = max_value_length.max(length);
+
+                        loop {
+                            if let Some(num) = iter.next() {
+                                match num.cmp(&max_value) {
+                                    Ordering::Less => continue,
+                                    Ordering::Equal => {}
+                                    Ordering::Greater => {
+                                        max_value = num;
+                                        max_value_length = 1;
+                                    }
+                                }
+
+                                length = 1;
+
+                                break;
+                            }
+
+                            break 'outer;
+                        }
+                    }
+                    Ordering::Equal => length += 1,
+                    Ordering::Greater => {
+                        max_value = num;
+                        max_value_length = 1;
+                        length = 1;
+                    }
+                }
+            } else {
+                max_value_length = max_value_length.max(length);
+
+                break;
+            }
+        }
+
+        max_value_length
+    }
+}
+
+// ------------------------------------------------------ snip ------------------------------------------------------ //
+
+impl super::Solution for Solution {
+    fn longest_subarray(nums: Vec<i32>) -> i32 {
+        Self::longest_subarray(nums)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    #[test]
+    fn test_solution() {
+        super::super::tests::run::<super::Solution>();
+    }
+}