Create: 1443-minimum-time-to-collect-all-apples-in-a-tree.rs

rust/1443-minimum-time-to-collect-all-apples-in-a-tree.rs

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+use std::collections::HashMap;
+
+impl Solution {
+    pub fn min_time(n: i32, edges: Vec<Vec<i32>>, has_apple: Vec<bool>) -> i32 {
+        let mut adj = HashMap::new();
+
+        for edge in edges {
+            let (parent, child) = (edge[0], edge[1]);
+            adj.entry(parent).or_insert(vec![]).push(child);
+            adj.entry(child).or_insert(vec![]).push(parent);
+        }
+
+        fn dfs(
+            current: i32,
+            parent: i32,
+            adj: &HashMap<i32, Vec<i32>>,
+            has_apple: &Vec<bool>,
+        ) -> i32 {
+            let mut time = 0;
+
+            if let Some(children) = adj.get(&current) {
+                for child in children {
+                    if *child == parent {
+                        continue;
+                    }
+                    let child_time = dfs(*child, current, &adj, &has_apple);
+
+                    if child_time.is_positive() || has_apple[*child as usize] {
+                        time += 2 + child_time;
+                    }
+                }
+            }
+
+            time
+        }
+
+        dfs(0, -1, &adj, &has_apple)
+    }
+}