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Copy pathCreateTree.java
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49 lines (42 loc) · 1.26 KB
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package tree.base;
import tree.TreeNode;
public class CreateTree {
public static TreeNode create(int[] nums) {
return create(nums, 0);
}
public static TreeNode create(int[] nums, int index) {
TreeNode tn = null;
if (index < nums.length) {
Integer value = nums[index];
if (value == null) {
return null;
}
tn = new TreeNode(value);
tn.left = create(nums, 2 * index + 1);
tn.right = create(nums, 2 * index + 2);
return tn;
}
return tn;
}
public static TreeNode createBinaryTree(int[] nums) {
TreeNode root = null;
for (int value : nums) {
root = createBinaryTree(root, value);
}
return root;
}
private static TreeNode createBinaryTree(TreeNode node, int value) {
if (node == null) {
return new TreeNode(value);
}
TreeNode newNode = new TreeNode(value);
if (value < node.getValue()) {
node.left = createBinaryTree(node.left, value);
} else if (value > node.getValue()) {
node.right = createBinaryTree(node.right, value);
} else {
return node;
}
return node;
}
}