紫书习题: https://cn.vjudge.net/article/45
蓝书习题: https://cn.vjudge.net/article/61
https://cn.vjudge.net/article/755
白书习题: https://cn.vjudge.net/article/426
俞勇<题目与解读> 上海交通大学
https://cn.vjudge.net/article/703
https://cn.vjudge.net/article/772
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