From 82ffd7dda4d0e4314f7f0712e8563a9736131546 Mon Sep 17 00:00:00 2001
From: Yubo Liu <liuyubobobo@gmail.com>
Date: Sun, 19 May 2019 01:41:29 -0700
Subject: [PATCH] 1038 added.

---
 .../cpp-1038/CMakeLists.txt                   |  6 ++
 .../cpp-1038/main.cpp                         | 65 +++++++++++++++++++
 .../cpp-1038/main2.cpp                        | 52 +++++++++++++++
 readme.md                                     |  1 +
 4 files changed, 124 insertions(+)
 create mode 100644 1038-Binary-Search-Tree-to-Greater-Sum-Tree/cpp-1038/CMakeLists.txt
 create mode 100644 1038-Binary-Search-Tree-to-Greater-Sum-Tree/cpp-1038/main.cpp
 create mode 100644 1038-Binary-Search-Tree-to-Greater-Sum-Tree/cpp-1038/main2.cpp

diff --git a/1038-Binary-Search-Tree-to-Greater-Sum-Tree/cpp-1038/CMakeLists.txt b/1038-Binary-Search-Tree-to-Greater-Sum-Tree/cpp-1038/CMakeLists.txt
new file mode 100644
index 00000000..7f3bfb51
--- /dev/null
+++ b/1038-Binary-Search-Tree-to-Greater-Sum-Tree/cpp-1038/CMakeLists.txt
@@ -0,0 +1,6 @@
+cmake_minimum_required(VERSION 3.14)
+project(B)
+
+set(CMAKE_CXX_STANDARD 14)
+
+add_executable(B main2.cpp)
\ No newline at end of file
diff --git a/1038-Binary-Search-Tree-to-Greater-Sum-Tree/cpp-1038/main.cpp b/1038-Binary-Search-Tree-to-Greater-Sum-Tree/cpp-1038/main.cpp
new file mode 100644
index 00000000..04ba8562
--- /dev/null
+++ b/1038-Binary-Search-Tree-to-Greater-Sum-Tree/cpp-1038/main.cpp
@@ -0,0 +1,65 @@
+/// Source : https://leetcode.com/problems/binary-search-tree-to-greater-sum-tree/
+/// Author : liuyubobobo
+/// Time   : 2019-05-04
+
+#include <iostream>
+#include <vector>
+
+using namespace std;
+
+
+/// Inorder Traversal and Store all values
+/// Time Complexity: O(2n)
+/// Space Complexity: O(n)
+
+/// Definition for a binary tree node.
+struct TreeNode {
+    int val;
+    TreeNode *left;
+    TreeNode *right;
+    TreeNode(int x) : val(x), left(NULL), right(NULL) {}
+};
+
+class Solution {
+
+private:
+    int index = 0;
+
+public:
+    TreeNode* bstToGst(TreeNode* root) {
+
+        if(!root) return root;
+        if(!root->left && !root->right) return root;
+
+        vector<int> order;
+        inorder(root, order);
+
+        for(int i = order.size() - 2; i >= 0; i --)
+            order[i] += order[i + 1];
+
+        index = 0;
+        go(root, order);
+        return root;
+    }
+
+private:
+    void inorder(TreeNode* root, vector<int>& order){
+
+        if(root->left) inorder(root->left, order);
+        order.push_back(root->val);
+        if(root->right) inorder(root->right, order);
+    }
+
+    void go(TreeNode* root, const vector<int>& order){
+
+        if(root->left) go(root->left, order);
+        root->val = order[index ++];
+        if(root->right) go(root->right, order);
+    }
+};
+
+
+int main() {
+
+    return 0;
+}
\ No newline at end of file
diff --git a/1038-Binary-Search-Tree-to-Greater-Sum-Tree/cpp-1038/main2.cpp b/1038-Binary-Search-Tree-to-Greater-Sum-Tree/cpp-1038/main2.cpp
new file mode 100644
index 00000000..328025ea
--- /dev/null
+++ b/1038-Binary-Search-Tree-to-Greater-Sum-Tree/cpp-1038/main2.cpp
@@ -0,0 +1,52 @@
+/// Source : https://leetcode.com/problems/binary-search-tree-to-greater-sum-tree/
+/// Author : liuyubobobo
+/// Time   : 2019-05-19
+
+#include <iostream>
+#include <vector>
+
+using namespace std;
+
+
+/// Inorder Traversal and Change the values during traversal
+/// Using a class member pre
+///
+/// Time Complexity: O(n)
+/// Space Complexity: O(h)
+
+/// Definition for a binary tree node.
+struct TreeNode {
+    int val;
+    TreeNode *left;
+    TreeNode *right;
+    TreeNode(int x) : val(x), left(NULL), right(NULL) {}
+};
+
+class Solution {
+
+private:
+    int pre = 0;
+
+public:
+    TreeNode* bstToGst(TreeNode* root) {
+
+        if(!root) return root;
+
+        if(root->right)
+            bstToGst(root->right);
+
+        pre += root->val;
+        root->val = pre;
+
+        if(root->left)
+            bstToGst(root->left);
+
+        return root;
+    }
+};
+
+
+int main() {
+
+    return 0;
+}
\ No newline at end of file
diff --git a/readme.md b/readme.md
index 38a7bac9..0166b165 100644
--- a/readme.md
+++ b/readme.md
@@ -721,4 +721,5 @@ email: [liuyubobobo@gmail.com](mailto:liuyubobobo@gmail.com)
 | 1035 | [Uncrossed Lines](https://leetcode.com/problems/uncrossed-lines/) | [无] | [C++](1035-Uncrossed-Lines/cpp-1035/) | | |
 | 1036 | [Escape a Large Maze](https://leetcode.com/problems/escape-a-large-maze/) | [无] | [C++](1036-Escape-a-Large-Maze/cpp-1036/) | | |
 | 1037 | [Valid Boomerang](https://leetcode.com/problems/valid-boomerang/) | [无] | [C++](1037-Valid-Boomerang/cpp-1037/) | | |
+| 1038 | [Binary Search Tree to Greater Sum Tree](https://leetcode.com/problems/binary-search-tree-to-greater-sum-tree/) | [无] | [C++](1038-Binary-Search-Tree-to-Greater-Sum-Tree/cpp-1038/) | | |
 | | | | | | |
\ No newline at end of file