894 | All Possible Full Binary Trees | C++

C++/All_Possible_Full_Binary_Trees.cpp

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+/**
+ * Definition for a binary tree node.
+ * 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) {}
+ * };
+ */
+class Solution {
+public:
+    vector<TreeNode*> allPossibleFBT(int n) {
+        vector<TreeNode*> dp[21];
+
+        TreeNode *temp;
+        temp = new TreeNode;
+        *temp = TreeNode();
+        dp[1].push_back(temp);
+
+        for(int i=3;i<20;i+=2)
+        {
+            for(int j=1; j<i; j+=2)
+            {
+                int ln = dp[j].size();
+                int rn = dp[i-j-1].size();
+                for(int k=0; k<ln; k++)
+                {
+                    for(int l=0; l<rn; l++)
+                    {
+                        temp = new TreeNode;
+                        *temp = TreeNode(0, dp[j][k], dp[i-j-1][l]);
+                        dp[i].push_back(temp);
+                    }
+                }
+            }
+        }
+
+        return dp[n];
+    }
+};