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Problem Description This is Kolakosiki sequence: 1,2,2,1,1,2,1,2,2,1,2,2,1,1,2,1,1,2,2,1……. This sequence consists of 1 and 2, and its first term equa 阅读全文
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Problem Description You are given a permutation a from 0 to n−1 and a permutation b from 0 to m−1.Define that the domain of function f is the set of i 阅读全文
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Problem Description Talented Mr.Tang has n strings consisting of only lower case characters. He wants to charge them with Balala Power (he could chang 阅读全文
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Problem Description Today is Ignatius' birthday. He invites a lot of friends. Now it's dinner time. Ignatius wants to know how many tables he needs at 阅读全文
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Problem Description We define the distance of two strings A and B with same length n isdisA,B=∑i=0n−1|Ai−Bn−1−i|The difference between the two charact 阅读全文
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Problem Description Give an array A, the index starts from 1.Now we want to know Bi=maxi∤jAj , i≥2. Input The first line of the input gives the number 阅读全文
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Problem Description The school set up three elective courses, assuming that these courses are A, B, C. N classes of students enrolled in these courses 阅读全文
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Problem Description RXD has a tree T, with the size of n. Each edge has a cost.Define f(S) as the the cost of the minimal Steiner Tree of the set S on 阅读全文
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Problem Description As we know, Rikka is poor at math. Yuta is worrying about this situation, so he gives Rikka some math tasks to practice. There is 阅读全文
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Problem Description As we know, Rikka is poor at math. Yuta is worrying about this situation, so he gives Rikka some math tasks to practice. There is 阅读全文
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Problem Description As we know, Rikka is poor at math. Yuta is worrying about this situation, so he gives Rikka some math tasks to practice. There is 阅读全文
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Problem Description Give you an array A[1..n]，you need to calculate how many tuples (i,j,k) satisfy that (i<j<k) and ((A[i] xor A[j])<(A[j] xor A[k])) 阅读全文
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Problem Description Little Q's clock is alarming! It's time to get up now! However, after reading the time on the clock, Little Q lies down and starts 阅读全文
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Problem Description In order to get better results in official ACM/ICPC contests, the team leader comes up with a questionnaire. He asked everyone in 阅读全文