C在二维数组中搜索重复项并使用索引

def find_duplicates_in_2d_array(arr):
    duplicates = {}
    for i in range(len(arr)):
        for j in range(len(arr[i])):
            if arr[i][j] in duplicates:
                duplicates[arr[i][j]].append((i, j))
            else:
                duplicates[arr[i][j]] = [(i, j)]
    
    # Filter out the elements that are not duplicates
    duplicates = {key: value for key, value in duplicates.items() if len(value) > 1}
    return duplicates

# Example usage
arr = [
    [1, 2, 3],
    [4, 5, 6],
    [7, 2, 9]
]

duplicates = find_duplicates_in_2d_array(arr)
print(duplicates)