摘要：
HDU3592 World Exhibition 因为求的是第一个数减去第n个数，所以我们让所有的差的形式都变为一个小的数减去一个大的数，从而使用差分约束系统。 有x个(a, b, c） 其中保证a = w 则q = w + p,不好， p = w q,p include include inclu 阅读全文
摘要：
题目描述 Once upon a time there lived a good fairy A. One day a fine young man B came to her and asked to predict his future. The fairy looked into her ma 阅读全文