将多个列表压缩在一起

# 简单合并
list1 = [1, 2, 3]
list2 = [4, 5, 6]
merged_list = list1 + list2
print(merged_list)  # 输出: [1, 2, 3, 4, 5, 6]

# 深度合并（处理嵌套列表）
nested_list = [[1, 2], [3, 4], [5, 6]]
flattened_list = [item for sublist in nested_list for item in sublist]
print(flattened_list)  # 输出: [1, 2, 3, 4, 5, 6]

// 简单合并
let list1 = [1, 2, 3];
let list2 = [4, 5, 6];
let mergedList = list1.concat(list2);
console.log(mergedList);  // 输出: [1, 2, 3, 4, 5, 6]

// 深度合并（处理嵌套数组）
let nestedList = [[1, 2], [3, 4], [5, 6]];
let flattenedList = nestedList.reduce((acc, val) => acc.concat(val), []);
console.log(flattenedList);  // 输出: [1, 2, 3, 4, 5, 6]

import itertools

large_list1 = range(1000000)
large_list2 = range(1000000, 2000000)
merged_large_list = list(itertools.chain(large_list1, large_list2))