From 909d89a2974c96336dcaf8fb9fca870f3e3389ab Mon Sep 17 00:00:00 2001
From: jackfiled <xcrenchangjun@outlook.com>
Date: Wed, 28 May 2025 14:15:13 +0800
Subject: [PATCH] 20250528 finished.

---
 src/problem/mod.rs                            |   2 +
 ...f_target_nodes_after_connecting_trees_i.rs | 113 ++++++++++++++++++
 2 files changed, 115 insertions(+)
 create mode 100644 src/problem/p3372_maximize_the_number_of_target_nodes_after_connecting_trees_i.rs

diff --git a/src/problem/mod.rs b/src/problem/mod.rs
index 1c6e6af..2c54675 100644
--- a/src/problem/mod.rs
+++ b/src/problem/mod.rs
@@ -680,3 +680,5 @@ mod p2131_longest_palindrome_by_concatenating_two_letter_words;
 mod p1857_largest_color_value_in_a_directed_graph;
 
 mod p2894_divisible_and_non_divisible_sums_difference;
+
+mod p3372_maximize_the_number_of_target_nodes_after_connecting_trees_i;
diff --git a/src/problem/p3372_maximize_the_number_of_target_nodes_after_connecting_trees_i.rs b/src/problem/p3372_maximize_the_number_of_target_nodes_after_connecting_trees_i.rs
new file mode 100644
index 0000000..f74968c
--- /dev/null
+++ b/src/problem/p3372_maximize_the_number_of_target_nodes_after_connecting_trees_i.rs
@@ -0,0 +1,113 @@
+/**
+ * [3372] Maximize the Number of Target Nodes After Connecting Trees I
+ */
+pub struct Solution {}
+
+// submission codes start here
+use std::collections::VecDeque;
+
+impl Solution {
+    pub fn max_target_nodes(edges1: Vec<Vec<i32>>, edges2: Vec<Vec<i32>>, k: i32) -> Vec<i32> {
+        // 首先构建邻接矩阵
+        let adjacent_matrix1 = Self::construct_adjacent_matrix(&edges1);
+        let adjacent_matrix2 = Self::construct_adjacent_matrix(&edges2);
+
+        let target_pointer_counts1 = Self::calculate_target_pointer_counts(&adjacent_matrix1, k);
+        let target_pointer_counts2 =
+            Self::calculate_target_pointer_counts(&adjacent_matrix2, k - 1);
+        let max_count = *target_pointer_counts2.iter().max().unwrap();
+
+        target_pointer_counts1
+            .iter()
+            .map(|&c| c + max_count)
+            .collect()
+    }
+
+    fn construct_adjacent_matrix(edges: &Vec<Vec<i32>>) -> Vec<Vec<usize>> {
+        let n = edges.len() + 1;
+        let mut adjacent_matrix = vec![vec![]; n];
+
+        for edge in edges.iter() {
+            let first = edge[0] as usize;
+            let second = edge[1] as usize;
+
+            adjacent_matrix[first].push(second);
+            adjacent_matrix[second].push(first);
+        }
+
+        adjacent_matrix
+    }
+
+    fn calculate_target_pointer_counts(
+        adjacent_matrix: &Vec<Vec<usize>>,
+        distance: i32,
+    ) -> Vec<i32> {
+        let mut queue = VecDeque::new();
+
+        (0..adjacent_matrix.len())
+            .map(|i| {
+                let mut count = 0;
+
+                queue.clear();
+                if distance >= 0 {
+                    queue.push_back((i, 0, None));
+                }
+
+                while let Some((pos, c, parent)) = queue.pop_front() {
+                    count += 1;
+
+                    if c + 1 <= distance {
+                        for &next in adjacent_matrix[pos].iter() {
+                            if parent.filter(|x| x == &next).is_some() {
+                                continue;
+                            }
+
+                            queue.push_back((next, c + 1, Some(pos)));
+                        }
+                    }
+                }
+
+                count
+            })
+            .collect()
+    }
+}
+
+// submission codes end
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_3372() {
+        assert_eq!(
+            vec![1, 1],
+            Solution::max_target_nodes(vec![vec![0, 1]], vec![vec![0, 1]], 0)
+        );
+        assert_eq!(
+            vec![9, 7, 9, 8, 8],
+            Solution::max_target_nodes(
+                vec![vec![0, 1], vec![0, 2], vec![2, 3], vec![2, 4]],
+                vec![
+                    vec![0, 1],
+                    vec![0, 2],
+                    vec![0, 3],
+                    vec![2, 7],
+                    vec![1, 4],
+                    vec![4, 5],
+                    vec![4, 6]
+                ],
+                2
+            )
+        );
+        assert_eq!(
+            vec![6, 3, 3, 3, 3],
+            Solution::max_target_nodes(
+                vec![vec![0, 1], vec![0, 2], vec![0, 3], vec![0, 4]],
+                vec![vec![0, 1], vec![1, 2], vec![2, 3]],
+                1
+            )
+        );
+    }
+}