501. Find Mode in Binary Search Tree#2
Solution#1
Problem#1
1. 沒什麼想法
2. int不能為null，但是Integer可以
3. Integer初始化是考慮是否置null
Problem#2
1. 泛型只能是類
2. list有clear方法
3. 計數器未復位
4. 條件未改變
5. 邊界條件未考慮清楚
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501. Find Mode in Binary Search Tree#2
Solution#1 Problem#1 1. 沒什麼想法 2. int不能為null，但是Integer可以 3. Integer初始化是考慮是否置null Problem#2 1.
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