Given a sequence of integers a1, a2, ..., an and q pairs of integers (l 1, r1), (l2, r2), ..., (lq, rq), find count(l1, r1), count(l2, r2), ..., count(lq, rq) where count(i, j) is the number of different integers among a 1, a2, ..., ai , aj , aj +…
题目链接:https://www.nowcoder.com/acm/contest/140/J 时间限制:C/C++ 4秒,其他语言8秒 空间限制:C/C++ 262144K,其他语言524288K 64bit IO Format: %lld 题目描述 White Rabbit has a rectangular farmland of n*m. In each of the grid there is a kind of plant. The plant in the j-th column…
题目链接:https://www.nowcoder.com/acm/contest/139/J 题目描述 Given a sequence of integers a1, a2, ..., an and q pairs of integers (l1, r1), (l2, r2), ..., (lq, rq), find count(l1, r1), count(l2, r2), ..., count(lq, rq) where count(i, j) is the number of dif…
题意:裸的莫队题,每个查询Li,Ri,返回区间[1,Li]和[Ri,N]区间中不同的数的个数. 分析:正常的离线查询,是求区间[Li,Ri]中要求的答案,而该题所求答案为外侧两个区间中的答案,那么cnt[i]维护的东西修改一下即可.对查询排序的时候,将R较大的排在前面,因为对于所维护的区间,是从两侧往内递推过来的,这样才能令不必要的递推减少. 此外,也有用主席树和树状数组的做法. #include<bits/stdc++.h> using namespace std; ; int pos[ma…
题意: 给定n个数字, 然后给出m个区间, 求区间外其他数字的种类有多少. 分析: 将区间以r为基准升序排序, 每次处理pre~r的数字第一次出现的位置. #include<bits/stdc++.h> using namespace std; ; int a[maxN], bit[maxN], ans[maxN]; int n, q; int lowbit(int x){ return x & -x; } int sum(int x){ ; ){ res += bit[x]; x -…
链接:https://www.nowcoder.com/acm/contest/147/E 来源:牛客网 题目描述 Niuniu likes to play OSU! We simplify the game OSU to the following problem. Given n and m, there are n clicks. Each click may success or fail. For a continuous success sequence with length X,…
链接:https://www.nowcoder.com/acm/contest/145/C 来源:牛客网 题目描述 A binary string s of length N = 2n is given. You will perform the following operation n times : - Choose one of the operators AND (&), OR (|) or XOR (^). Suppose the current and s2i. For examp…
