From f91eaffcb3872007f84cffbe82d2767de0d9bcef Mon Sep 17 00:00:00 2001
From: jackfiled <xcrenchangjun@outlook.com>
Date: Thu, 29 May 2025 14:01:23 +0800
Subject: [PATCH] 20250529 finished.

---
 src/problem/mod.rs                            |   2 +
 ..._target_nodes_after_connecting_trees_ii.rs | 107 ++++++++++++++++++
 2 files changed, 109 insertions(+)
 create mode 100644 src/problem/p3373_maximize_the_number_of_target_nodes_after_connecting_trees_ii.rs

diff --git a/src/problem/mod.rs b/src/problem/mod.rs
index 2c54675..53fd04c 100644
--- a/src/problem/mod.rs
+++ b/src/problem/mod.rs
@@ -682,3 +682,5 @@ 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;
+
+mod p3373_maximize_the_number_of_target_nodes_after_connecting_trees_ii;
diff --git a/src/problem/p3373_maximize_the_number_of_target_nodes_after_connecting_trees_ii.rs b/src/problem/p3373_maximize_the_number_of_target_nodes_after_connecting_trees_ii.rs
new file mode 100644
index 0000000..3a41f51
--- /dev/null
+++ b/src/problem/p3373_maximize_the_number_of_target_nodes_after_connecting_trees_ii.rs
@@ -0,0 +1,107 @@
+/**
+ * [3373] Maximize the Number of Target Nodes After Connecting Trees II
+ */
+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>>) -> Vec<i32> {
+        let adjacent_matrix1 = Self::construct_adjacent_matrix(&edges1);
+        let adjacent_matrix2 = Self::construct_adjacent_matrix(&edges2);
+
+        let (even_count1, odd_count1, color1) =
+            Self::calculate_target_pointer_counts(&adjacent_matrix1);
+        let (even_count2, odd_count2, _) = Self::calculate_target_pointer_counts(&adjacent_matrix2);
+
+        let max_count = odd_count2.max(even_count2);
+
+        (0..adjacent_matrix1.len())
+            .map(|i| {
+                if color1[i] {
+                    even_count1 + max_count
+                } else {
+                    odd_count1 + 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>>) -> (i32, i32, Vec<bool>) {
+        let mut queue = VecDeque::new();
+        // 染色数组
+        // true表示距离为偶数
+        // false表示距离为奇数
+        let mut color = vec![false; adjacent_matrix.len()];
+        // 距离为偶数的计数
+        let mut result = 0;
+
+        queue.push_back((0, 0, None));
+
+        while let Some((pos, c, parent)) = queue.pop_front() {
+            if c % 2 == 0 {
+                color[pos] = true;
+                result += 1;
+            }
+
+            for &next in adjacent_matrix[pos].iter() {
+                if parent.filter(|x| x == &next).is_some() {
+                    continue;
+                }
+
+                queue.push_back((next, c + 1, Some(pos)));
+            }
+        }
+
+        (result, adjacent_matrix.len() as i32 - result, color)
+    }
+}
+
+// submission codes end
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_3373() {
+        assert_eq!(
+            vec![8, 7, 7, 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]
+                ]
+            )
+        );
+        assert_eq!(
+            vec![3, 6, 6, 6, 6],
+            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]]
+            )
+        );
+    }
+}