返回元素在数组中所有出现的位置 @param elem 待查找的元素 @param start 起始查找位置(包含) @param isSorted 当前数组是否有序 @param isFromHead true:从头开始遍历,false:从尾向前开始遍历 @return IntArray
(Object elem, int start, boolean isSorted, boolean isFromHead)
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nothing calls this directly
no test coverage detected