from collections import Counterdef find_common_elements(arr1, arr2): # 统计数组中每个数字的出现次数 counter1 = Counter(arr1) counter2 = Counter(arr2) # 找出两个数组中同时出现的整数 common_elements = set(arr1) & set(arr2) # 如果没有同时出现的整数，返回NULL if not common_elements: return "NULL" # 统计每个共同元素在两个数组中的最小出现次数 count_dict = {} for num in common_elements: count_dict[num] = min(counter1[num], counter2[num]) # 根据出现次数进行分类 grouped = {} for num, count in count_dict.items: if count not in grouped: grouped[count] = grouped[count].append(num) # 输出结果 result = for count in sorted(grouped.keys): result.append(f"出现次数:{count}：" + ",".join(map(str, sorted(grouped[count])))) return "\n".join(result)# 输入处理arr1 = list(map(int, input.split(',')))arr2 = list(map(int, input.split(',')))# 调用函数并输出结果print(find_common_elements(arr1, arr2))摘要：from collections import Counterdef find_common_elements(arr1, arr2): # 统计数组中每个数字的出现次数 counter1 = Counter(arr1) counter2 = Counter(
来源：小胡科技每日一讲