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TreeNode.java
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64 lines (52 loc) · 1.5 KB
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package datatype;
public class TreeNode {
public int val;
public TreeNode left;
public TreeNode right;
public TreeNode(int val) {
this.val = val;
}
public TreeNode(int val, TreeNode left, TreeNode right) {
this.val = val;
this.left = left;
this.right = right;
}
TreeNode constructFromArray(Integer[] vals, int k) {
if (k >= vals.length || vals[k] == null) {
return null;
}
TreeNode root = new TreeNode(vals[k]);
int leftIndex = 2 * k + 1;
root.left = constructFromArray(vals, leftIndex);
int rightIndex = 2 * k + 2;
root.right = constructFromArray(vals, rightIndex);
return root;
}
public TreeNode(Integer[] vals) {
if (vals.length == 0) {
left = null;
right = null;
}
val = vals[0];
left = constructFromArray(vals, 1);
right = constructFromArray(vals, 2);
}
@Override
public String toString() {
return "" + val;
}
void print_r(TreeNode node, int level, StringBuilder sb) {
if (node != null) {
print_r(node.right, level + 1, sb);
sb.append("\t".repeat(Math.max(0, level)));
sb.append(node.val);
sb.append("\n");
print_r(node.left, level + 1, sb);
}
}
public String prettyPrint() {
StringBuilder sb = new StringBuilder();
print_r(this, 0, sb);
return sb.toString();
}
}