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Optimize arrToTree function

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in java, cpp, py, go, js, ts.
This commit is contained in:
Yudong Jin
2023-01-08 19:03:22 +08:00
parent c411969bd1
commit dcc3b2e35b
29 changed files with 222 additions and 114 deletions
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15
codes/javascript/include/TreeNode.js
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@ -14,7 +14,7 @@ function TreeNode(val, left, right) {
}
/**
* Generate a binary tree with an array
* Generate a binary tree given an array
* @param arr
* @return
*/
@ -24,20 +24,21 @@ function arrToTree(arr) {
let root = new TreeNode(arr[0]);
let queue = [root]
let i = 1;
while(queue.length) {
let i = 0;
while (queue.length) {
let node = queue.shift();
if(arr[i] !== null) {
if (++i >= arr.length) break;
if (arr[i] !== null) {
node.left = new TreeNode(arr[i]);
queue.push(node.left);
}
i++;
if(arr[i] !== null) {
if (++i >= arr.length) break;
if (arr[i] !== null) {
node.right = new TreeNode(arr[i]);
queue.push(node.right);
}
i++;
}
return root;
}