Crazy Bobo Time Limit: 6000/3000 MS (Java/Others)    Memory Limit: 131072/65536 K (Java/Others) Total Submission(s): 1215    Accepted Submission(s): 366 Problem Description Bobo has a tree,whose vertices are conveniently labeled by 1,2,...,n.Each nod…

Tricks Device Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others) Total Submission(s): 1977    Accepted Submission(s): 509 Problem Description Innocent Wu follows Dumb Zhang into a ancient tomb. Innocent Wu’s at the en…

Solve this interesting problem Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 422    Accepted Submission(s): 98 Problem Description Have you learned something about segment tree? If not, don’t…

Friends Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others) Total Submission(s): 163    Accepted Submission(s): 61 Problem Description There are n people and m pairs of friends. For every pair of friends, they can choo…

Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others) Total Submission(s): 593    Accepted Submission(s): 164 Problem Description There are n circles on a infinitely large table.With every two circle, either one contains…

CRB has a tree, whose vertices are labeled by 1, 2, …, N. They are connected by N – 1 edges. Each edge has a weight. For any two vertices u and v(possibly equal), f(u,v) is xor(exclusive-or) sum of weights of all edges on the path from u to v. CRB’s…

Virtual Participation Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others) Total Submission(s): 237    Accepted Submission(s): 56 Special Judge Problem Description As we know, Rikka is poor at math. Yuta is worrying abo…

Connect the Graph Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others) Total Submission(s): 108    Accepted Submission(s): 36 Special Judge Problem Description Once there was a special graph. This graph had n vertices a…

Fantasy magicians usually gain their ability through one of three usual methods: possessing it as an innate talent, gaining it through study and practice, or receiving it from another being, often a god, spirit, or demon of some sort. Some wizards ar…

Painter Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others) Total Submission(s): 895    Accepted Submission(s): 408 Problem Description Mr. Hdu is an painter, as we all know, painters need ideas to innovate , one day,…