题目链接: hdu:http://acm.hdu.edu.cn/showproblem.php?pid=5661 bc(中文):http://bestcoder.hdu.edu.cn/contests/contest_chineseproblem.php?cid=686&pid=1002 题解: 考虑从高位到低位贪心,对于每一位, (1).如果x,y只有唯一的取法,那么只能这么取:否则贪心地必须使答案的这一位等于1. (2).如果x,y都是0,1都能取,则设这是从右向左数第len位,因为x,y能…

Claris and XOR Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 744    Accepted Submission(s): 330 Problem Description Claris loves bitwise operations very much, especially XOR, because it has ma…

http://acm.hdu.edu.cn/showproblem.php?pid=5661 Claris and XOR Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others) Total Submission(s): 146    Accepted Submission(s): 51 Problem Description Claris loves bitwise operatio…

Claris and XOR Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 332    Accepted Submission(s): 135 Problem Description Claris loves bitwise operations very much, especially XOR, because it has ma…

我们求二进制是怎么求的呢:先看看二进制的每一位代表多大:.......32 16 8 4 2 1 假如n=10, ..... 32>n ,不要. 16>n,不要. 8<=n,要,然后n=n-8=2. 4>2,不要. 2<=2,要,n=n-2=0: 0>1,不要. 不要是一位是0,要的一位是1,则10(10)=..001010(2),也就是从高位向低位求,能取则取. 题意:现在对对于这个题,求a<=x<=b,c<=y<=d,使x^y最大(不同位数最…

Elegant Construction 题目链接: http://acm.hdu.edu.cn/showproblem.php?pid=5813 Description Being an ACMer requires knowledge in many fields, because problems in this contest may use physics, biology, and even musicology as background. And now in this prob…

Windows 10 题目链接: http://acm.hdu.edu.cn/showproblem.php?pid=5802 Description Long long ago, there was an old monk living on the top of a mountain. Recently, our old monk found the operating system of his computer was updating to windows 10 automatical…

Reorder the Books Time Limit: 1 Sec Memory Limit: 256 MB 题目连接 http://acm.hdu.edu.cn/showproblem.php?pid=5500 Description dxy家收藏了一套书,这套书叫<SDOI故事集>,<SDOI故事集>有n(n≤19)n(n\leq 19)n(n≤19)本,每本书有一个编号,从111号到nnn号. dxy把这些书按编号从小到大,从上往下摞成一摞.dxy对这套书极其重视,不允许…

Four Operations Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 22    Accepted Submission(s): 12 Problem Description Little Ruins is a studious boy, recently he learned the four operations!Now h…

题目链接:pid=3697" target="_blank">http://acm.hdu.edu.cn/showproblem.php?pid=3697 Problem Description     A new Semester is coming and students are troubling for selecting courses. Students select their course on the web course system. There…