题目链接:http://codeforces.com/problemset/problem/617/E 一看这种区间查询的题目,考虑一下莫队. 如何${O(1)}$的修改和查询呢? 令${f(i,j)}$表示区间${\left [ l,r \right ]}$内数字的异或和. 那么:${f(l,r)=f(1,r)~~xor~~f(1,l-1)=k}$ 记一下前缀异或和即可维护. #include<iostream> #include<cstdio> #include<algo…

题目链接:http://codeforces.com/problemset/problem/617/E 题目: 给你a1 a2 a3 ··· an 个数,m次询问:在[L, R] 里面又多少中 [l, r] 使得 al xor al+1 xor ··· ar 为 k. 题解: 本题只有区间查询没有区间修改,而且数据量不大(10w),所以可以用离线的方法解决. 使用莫队算法来解决,就需要O(1)的修改[L, R+1] .[L, R-1].[L+1, R].[L-1, R]. 详细的莫队可以百度学一…

题目链接: E. XOR and Favorite Number time limit per test 4 seconds memory limit per test 256 megabytes input standard input output standard output Bob has a favorite number k and ai of length n. Now he asks you to answer m queries. Each query is given by…

http://codeforces.com/problemset/problem/617/E 题意:给出n个数,q个询问区间,问这个区间里面有多少个区间[i,j]可以使得ai^ai+1^...^aj = k. 思路:根据xor的性质,可以处理出前缀异或和sum[],那么要使结果等于k,就是sum[i-1]^sum[j] == k,即sum[j]^k == sum[i-1],那么用一个数组cnt[]存储对于每一个sum[]的数量.然后用莫队算法做.莫队算法是一种离线处理区间问题的算法,在我看来是将…

time limit per test4 seconds memory limit per test256 megabytes inputstandard input outputstandard output Bob has a favorite number k and ai of length n. Now he asks you to answer m queries. Each query is given by a pair li and ri and asks you to cou…

E. XOR and Favorite Number 题目连接: http://www.codeforces.com/contest/617/problem/E Descriptionww.co Bob has a favorite number k and ai of length n. Now he asks you to answer m queries. Each query is given by a pair li and ri and asks you to count the n…

任意门:http://codeforces.com/problemset/problem/617/E E. XOR and Favorite Number time limit per test 4 seconds memory limit per test 256 megabytes input standard input output standard output Bob has a favorite number k and ai of length n. Now he asks yo…

题目链接:http://codeforces.com/problemset/problem/617/E E. XOR and Favorite Number time limit per test 4 seconds memory limit per test 256 megabytes input standard input output standard output Bob has a favorite number k and ai of length n. Now he asks y…

XOR and Favorite Number time limit per test: 4 seconds memory limit per test: 256 megabytes input: standard input output: standard output Bob has a favorite number k and ai of length n. Now he asks you to answer m queries. Each query is given by a pa…

E. XOR and Favorite Number time limit per test 4 seconds memory limit per test 256 megabytes input standard input output standard output Bob has a favorite number k and ai of length n. Now he asks you to answer m queries. Each query is given by a pai…