5 files changed, 94 insertions, 0 deletions
diff --git a/02-data_structures/04-binary_search_trees/01-tree_orders/tests/01 b/02-data_structures/04-binary_search_trees/01-tree_orders/tests/01
new file mode 100644
index 0000000..69028b1
--- /dev/null
+++ b/02-data_structures/04-binary_search_trees/01-tree_orders/tests/01
@@ -0,0 +1,6 @@
+5
+4 1 2
+2 3 4
+5 -1 -1
+1 -1 -1
+3 -1 -1
diff --git a/02-data_structures/04-binary_search_trees/01-tree_orders/tests/01.a b/02-data_structures/04-binary_search_trees/01-tree_orders/tests/01.a
new file mode 100644
index 0000000..92d3d39
--- /dev/null
+++ b/02-data_structures/04-binary_search_trees/01-tree_orders/tests/01.a
@@ -0,0 +1,3 @@
+1 2 3 4 5
+4 2 1 3 5
+1 3 2 5 4
diff --git a/02-data_structures/04-binary_search_trees/01-tree_orders/tests/02 b/02-data_structures/04-binary_search_trees/01-tree_orders/tests/02
new file mode 100644
index 0000000..995d50a
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+++ b/02-data_structures/04-binary_search_trees/01-tree_orders/tests/02
@@ -0,0 +1,11 @@
+10
+0 7 2
+10 -1 -1
+20 -1 6
+30 8 9
+40 3 -1
+50 -1 -1
+60 1 -1
+70 5 4
+80 -1 -1
+90 -1 -1
diff --git a/02-data_structures/04-binary_search_trees/01-tree_orders/tests/02.a b/02-data_structures/04-binary_search_trees/01-tree_orders/tests/02.a
new file mode 100644
index 0000000..98400cf
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+++ b/02-data_structures/04-binary_search_trees/01-tree_orders/tests/02.a
@@ -0,0 +1,3 @@
+50 70 80 30 90 40 0 20 10 60
+0 70 50 40 30 80 90 20 60 10
+50 80 90 30 40 70 10 60 20 0
diff --git a/02-data_structures/04-binary_search_trees/01-tree_orders/tree-orders.cpp b/02-data_structures/04-binary_search_trees/01-tree_orders/tree-orders.cpp
new file mode 100644
index 0000000..5ee679c
--- /dev/null
+++ b/02-data_structures/04-binary_search_trees/01-tree_orders/tree-orders.cpp
@@ -0,0 +1,71 @@
+#include <iostream>
+#include <vector>
+#include <algorithm>
+
+using std::vector;
+using std::ios_base;
+using std::cin;
+using std::cout;
+
+class TreeOrders {
+  int n;
+  vector <int> key;
+  vector <int> left;
+  vector <int> right;
+
+public:
+  void read() {
+    cin >> n;
+    key.resize(n);
+    left.resize(n);
+    right.resize(n);
+    for (int i = 0; i < n; i++) {
+      cin >> key[i] >> left[i] >> right[i];
+    }
+  }
+
+
+  vector <int> in_order() {
+    vector<int> result;
+    // Finish the implementation
+    // You may need to add a new recursive method to do that
+
+    return result;
+  }
+
+  vector <int> pre_order() {
+    vector<int> result;    
+    // Finish the implementation
+    // You may need to add a new recursive method to do that
+    
+    return result;
+  }
+
+  vector <int> post_order() {
+    vector<int> result;
+    // Finish the implementation
+    // You may need to add a new recursive method to do that
+    
+    return result;
+  }
+};
+
+void print(vector <int> a) {
+  for (size_t i = 0; i < a.size(); i++) {
+    if (i > 0) {
+      cout << ' ';
+    }
+    cout << a[i];
+  }
+  cout << '\n';
+}
+
+int main() {
+  ios_base::sync_with_stdio(0);
+  TreeOrders t;
+  t.read();
+  print(t.in_order());
+  print(t.pre_order());
+  print(t.post_order());
+  return 0;
+}