20240228 Finished

src/problem/mod.rs

@@ -57,4 +57,5 @@ mod p2583_kth_largest_sum_in_a_binary_tree;
 mod p2476_closest_nodes_queries_in_a_binary_search_tree;
 mod p938_range_sum_of_bst;
 mod p889_construct_binary_tree_from_preorder_and_postorder_traversal;
-mod p2867_count_valid_paths_in_a_tree;
+mod p2867_count_valid_paths_in_a_tree;
+mod p2673_make_costs_of_paths_equal_in_a_binary_tree;

src/problem/p2673_make_costs_of_paths_equal_in_a_binary_tree.rs

@@ -0,0 +1,40 @@
+/**
+ * [2673] Make Costs of Paths Equal in a Binary Tree
+ */
+pub struct Solution {}
+
+
+// submission codes start here
+
+impl Solution {
+    pub fn min_increments(n: i32, cost: Vec<i32>) -> i32 {
+        let mut result = 0;
+        let mut cost = cost;
+        let mut now = (n - 2) as usize;
+
+        loop {
+            result += (cost[now] - cost[now + 1]).abs();
+            cost[now / 2] += cost[now].max(cost[now + 1]);
+
+            if now <= 2 {
+                break;
+            }
+
+            now = now - 2;
+        }
+
+        result
+    }
+}
+
+// submission codes end
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_2673() {
+        assert_eq!(Solution::min_increments(7, vec![1,5,2,2,3,3,1]), 6);
+    }
+}