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添加(637.二叉树的层平均值):增加typescript版本
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@ -941,7 +941,32 @@ var averageOfLevels = function(root) {
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};
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```
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TypeScript:
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```typescript
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function averageOfLevels(root: TreeNode | null): number[] {
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let helperQueue: TreeNode[] = [];
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let resArr: number[] = [];
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let total: number = 0;
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let tempNode: TreeNode;
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if (root !== null) helperQueue.push(root);
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while (helperQueue.length > 0) {
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let length = helperQueue.length;
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for (let i = 0; i < length; i++) {
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tempNode = helperQueue.shift()!;
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total += tempNode.val;
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if (tempNode.left) helperQueue.push(tempNode.left);
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if (tempNode.right) helperQueue.push(tempNode.right);
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}
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resArr.push(total / length);
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total = 0;
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}
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return resArr;
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};
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```
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Swift:
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```swift
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func averageOfLevels(_ root: TreeNode?) -> [Double] {
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var res = [Double]()
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