[hdu]astar2014 资格赛 - fsygd's Blog
[hdu]astar2014 资格赛
中午12点写完HNOI2014 Day2的暴力，就翘考做起了astar2014的资格赛，题目的难度都不大，但题目和数据真是不能再坑。
0:11 C -1
A题没看懂，直接裸C，C很明显是trie，过了样例就自信地交了，TLE。。
0:21 A 1A
看懂了A题后，发现只要简单判一下无解的情况，然后暴力做就可以了，答案是log级别的。
0:35 C -2
用位运算优化了下常数，还是T掉了。。
0:46 D 1A
转战D题，发现就是一个O(n^3)的简单DP。。其实是可以O(n^2)的，只是当时我脑子进*了，就直接写O(n^3)了囧
1:12 C -3
1:13 C -4
继续优化常数，还用了指针，还是T了。在群里交流了下，发现@FancyCoder已经交了十几发了。
1:27 C 5A
我把读入优化去掉，结果WA掉了，我不禁陷入了深深的思考。。然后把题目中要求的0~32位改成了@xudyh说的0~31位，A了！！！只能说astar实在是太Kenji了。一开始还坚持不Rejudge，几个小时后还是Rejudge了。。
2:34 B 1A
被C题折磨过以后，不禁对世界产生了深深的怀疑。。
B题一开始还想用费用流来做，结果发现建图错了，如果建成正确的图就要O(n^3)了，就用O(n^2)的DP水过了。。
经过了两个半小时，总算是A完了，如果没有改动的话，应该是#20。
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