http://acm.hdu.edu.cn/showproblem.php?pid=5600 本文重在分析该题目的思路,代码极其短,但是想到这个题目的思路却是挺复杂的过程. 思路 自己拿到题目也想到了很多,用了一些小的样例去找寻一些规律,但是还是没有完全找到方法. 这个题目中重要的一点是你要能发现操作次数个数与N的奇偶的规律,(N是电灯的个数)N是奇数,操作次数一定是奇数,N是偶数,操作次数是偶数. 那么这幅图可以直观的理解上面这个结论. 下面你还可以得到一个结论,如果我要是的所有的灯全部熄灭的…

N bulbs Time Limit: 10000/5000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 559    Accepted Submission(s): 298 Problem Description N bulbs are in a row from left to right,some are on, and some are off.The first bu…

Gray code Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 569    Accepted Submission(s): 337 Problem Description The reflected binary code, also known as Gray code after Frank Gray, is a binary…

2019 杭电多校 8 1009 题目链接:HDU 6665 比赛链接:2019 Multi-University Training Contest 8 Problem Description Calabash is the servant of a landlord. The landlord owns a piece of land, which can be regarded as an infinite 2D plane. One day the landlord set up two…

Tempter of the Bone Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 55541    Accepted Submission(s): 14983 Problem Description The doggie found a bone in an ancient maze, which fascinated him a…

N bulbs  Accepts: 275  Submissions: 1237  Time Limit: 10000/5000 MS (Java/Others)  Memory Limit: 65536/65536 K (Java/Others) Problem Description N bulbs are in a row from left to right,some are on, and some are off.The first bulb is the most left one…

Cut Pieces Time Limit: 4000/2000 MS (Java/Others)    Memory Limit: 131072/65536 K (Java/Others) Total Submission(s): 728    Accepted Submission(s): 303 Problem Description Suppose we have a sequence of n blocks. Then we paint the blocks. Each block s…

题意:给定一个 n * m 的格子,从右上角(1, m) 开始每个玩家只能从向下,向左,或者向左下走,谁不能走,谁输. 析:自己做出来,看了网上的几个博客,好像都没说为什么是只有全奇的情况才会输,个人的理解如下,如果不对,欢迎指正. 首先,从(1, m)  走到 (n, 1) 这才是一个完整的,也就是如果论到谁开始移动的时候当时的位置是 (n, 1),那么它就输了,因为只能向下,向左,向左下,而这些方向都出界了.这样看不大好看,我们可以看成是从 (n, m) 走到 (1, 1),同理如果论到谁开…

Clock Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65535/65535 K (Java/Others)Total Submission(s): 500    Accepted Submission(s): 176 Problem Description Given a time HH:MM:SS and one parameter , you need to calculate next time satisfying…

HDU 模拟题, 枚举1002 1004 1013 1015 1017 1020 1022 1029 1031 1033 1034 1035 1036 1037 1039 1042 1047 1048 1049 1050 1057 1062 1063 1064 1070 1073 1075 1082 1083 1084 1088 1106 1107 1113 1117 1119 1128 1129 1144 1148 1157 1161 1170 1172 1177 1197 1200 1201…