题目链接:http://codeforces.com/problemset/problem/665/E (http://www.fjutacm.com/Problem.jsp?pid=2255) 题意:找出有多少个连续的区间[l,r](1 ≤ l ≤ r ≤ n),该区间中所有的数的异或值大于等于k: 思路:首先,如果是单看题目的话,会发现暴力的话复杂度是O(n^3),但是我们先预处理异或前缀和,然后你会发现[l,r]区间的异或和等于s[l-1]^s[r],这样就可以O(n^2)的求…
E. Beautiful Subarrays 题目连接: http://www.codeforces.com/contest/665/problem/E Description One day, ZS the Coder wrote down an array of integers a with elements a1, a2, ..., an. A subarray of the array a is a sequence al, al + 1, ..., ar for so…
题目链接: E. Beautiful Subarrays time limit per test 3 seconds memory limit per test 512 megabytes input standard input output standard output One day, ZS the Coder wrote down an array of integers a with elements a1, a2, ..., an. A subarray of the arr…
E. Beautiful Subarrays time limit per test: 3 seconds memory limit per test: 512 megabytes input: standard input output: standard output One day, ZS the Coder wrote down an array of integers a with elements a1, a2, ..., an. A subarray of the array…
As you might remember from the previous round, Vova is currently playing a strategic game known as Rage of Empires. Vova managed to build a large army, but forgot about the main person in the army - the commander. So he tries to hire a commander, and…
