From 185ef9fcb0e59f13e9ee0ccb261693cdaddebab0 Mon Sep 17 00:00:00 2001
From: crupest <crupest@outlook.com>
Date: Tue, 23 Feb 2021 21:07:19 +0800
Subject: import(solutions): Move leetcode solutions to subdir.

---
 works/solutions/leetcode/cpp/1609.cpp | 94 +++++++++++++++++++++++++++++++++++
 1 file changed, 94 insertions(+)
 create mode 100644 works/solutions/leetcode/cpp/1609.cpp

(limited to 'works/solutions/leetcode/cpp/1609.cpp')

diff --git a/works/solutions/leetcode/cpp/1609.cpp b/works/solutions/leetcode/cpp/1609.cpp
new file mode 100644
index 0000000..e446c0f
--- /dev/null
+++ b/works/solutions/leetcode/cpp/1609.cpp
@@ -0,0 +1,94 @@
+struct TreeNode
+{
+    int val;
+    TreeNode *left;
+    TreeNode *right;
+    TreeNode() : val(0), left(nullptr), right(nullptr) {}
+    TreeNode(int x) : val(x), left(nullptr), right(nullptr) {}
+    TreeNode(int x, TreeNode *left, TreeNode *right) : val(x), left(left), right(right) {}
+};
+
+#include <queue>
+
+class Solution
+{
+public:
+    bool isEvenOddTree(TreeNode *root)
+    {
+        if (root == nullptr)
+            return true;
+        std::queue<TreeNode *> odd_level;
+        std::queue<TreeNode *> even_level;
+
+        even_level.push(root);
+
+        while (true)
+        {
+            if (!odd_level.empty())
+            {
+                auto node = odd_level.front();
+                odd_level.pop();
+                if (node->left)
+                    even_level.push(node->left);
+                if (node->right)
+                    even_level.push(node->right);
+                int last = node->val;
+                if (last % 2 != 0)
+                    return false;
+
+                while (!odd_level.empty())
+                {
+                    node = odd_level.front();
+                    odd_level.pop();
+                    if (node->left)
+                        even_level.push(node->left);
+                    if (node->right)
+                        even_level.push(node->right);
+                    int val = node->val;
+                    if (val % 2 != 0)
+                        return false;
+                    if (val >= last)
+                        return false;
+                    last = val;
+                }
+
+                continue;
+            }
+
+            if (!even_level.empty())
+            {
+                auto node = even_level.front();
+                even_level.pop();
+                if (node->left)
+                    odd_level.push(node->left);
+                if (node->right)
+                    odd_level.push(node->right);
+                int last = node->val;
+                if (last % 2 == 0)
+                    return false;
+
+                while (!even_level.empty())
+                {
+                    node = even_level.front();
+                    even_level.pop();
+                    if (node->left)
+                        odd_level.push(node->left);
+                    if (node->right)
+                        odd_level.push(node->right);
+                    int val = node->val;
+                    if (val % 2 == 0)
+                        return false;
+                    if (val <= last)
+                        return false;
+                    last = val;
+                }
+
+                continue;
+            }
+
+            break;
+        }
+
+        return true;
+    }
+};
\ No newline at end of file
-- 
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