ZOJ Monthly, March 2014 (2014省赛练习)
2014-03-03 19:57
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Yes | 3757 | Alice and Bob and Cue Sports | 26.29% (56/213) |
Yes | 3758 | Singles' Day | 39.30% (79/201) |
3759 | 3456 | 25.92% (7/27) | |
Yes | 3760 | Treasure Hunting | 16.81% (37/220) |
Yes | 3761 | Easy billiards | 36.99% (64/173) |
Yes | 3762 | Pan's Labyrinth | 32.74% (37/113) |
3763 | Plasma Field | 22.72% (5/22) | |
3764 | New Governor's Problem | 32.85% (23/70) | |
Yes | 3765 | Lights | 42.35% (72/170) |
3766 | Gao the grid III | 10.00% (4/40) |
A(3757)大模拟,题意很清楚,对着一条一条规则写,
B(3758)unsigned long long直接sqrt(n)暴力判素数
D(3750)注意到p是偶数, 所以x[i]^x[i]奇偶性一样的点一定在一个集合内, 因为gcd(偶数,
p) > 1
所以按x[i]^y[i]的奇偶性来构造二分图, 然后按冲突建边 用总权值-最大流(最小割)即可
E(3761)把球处理成多个联通块,每个联通块通过dfs构造成一棵树,然后让叶子节点撞击其父亲节点即可,可以用栈来保存答案
F(3762)枚举一个点,先找到其最远点,然后在枚举第三个点,用这3个点构成的三角形去更新答案, O(n^2)
I(3765)伸展树裸体, 不过我用可持久化treapA掉了,相比之下后者比较好调
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