查找两个列表中最常见的顶部元素的索引

def find_common_elements(list1, list2):
    element_count = {}
    
    for element in list1:
        if element in element_count:
            element_count[element] += 1
        else:
            element_count[element] = 1
    
    for element in list2:
        if element in element_count:
            element_count[element] += 1
        else:
            element_count[element] = 1
    
    common_elements = []
    max_count = max(element_count.values())
    
    for element, count in element_count.items():
        if count == max_count:
            common_elements.append(list1.index(element))
    
    return common_elements