题解: 官方题解太简略了orz 具体实现的方式其实有很多 问题就在于确定A[j]以后,如何找符合条件的A[i] 这里其实就是要提前预处理好 我是倒序插入点的,所以要沿着A[k]爬树,找符合的A[i] 如果发现A[i]与A[k]的第p位不同,比如A[k]位1,A[i]为0,那么所有的在i右边的第p位为0的数就都可以充当A[j] 所以实际上就需要求出有多少点对(i, j),满足这个条件. 不妨用可持久化的思想考虑这个过程 倒序插入A[i]时,我们就能统计出来A[i]的第p位为0(或者为1)时,所有在…

地址:http://acm.split.hdu.edu.cn/showproblem.php?pid=6058 题目: Kanade's sum Time Limit: 4000/2000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 505    Accepted Submission(s): 176 Problem Description Give you an array …

转自:http://blog.csdn.net/dormousenone/article/details/76570172 /** 题目:hdu6059 Kanade's trio 链接:http://acm.hdu.edu.cn/showproblem.php?pid=6059 题意:含 N 个数字的 A 数组,求有多少个三元组 (i,j,k) 满足 i<j<k 且 (Ai⊕Aj)<(Aj⊕Ak) 思路: 利用字典树维护前 k-1 个数.当前处理第 k 个数. 显然对于 k 与 i 的…

题解: 其实贪心地算就可以了 一个最优的分配就是每条边权贡献的值为min(k, sz[x]),sz[x]是指子树的大小 然后最后加起来就是答案. #include <iostream> #include <cstring> #include <cstdio> #include <vector> #include <set> #define fi first #define se second using namespace std; ; type…

D. Events 线段树区间更新查询区间历史最小值,看似很简单的题意写了两天才写出来. 题意:n个数,Q次操作,每次操作对一个区间[l,r]的数同时加上C,然后输出这段区间的历史最小值. 思路:在线段树区间更新最值查询的基础上再用一个变量表示历史最小值,每次更新只需对当前最小值更新然后用当前最小值更新历史最小值.细节问题很不好处理,可能会有重复多次更新某个区间但是其下的子节点叶节点却没有更新,而是每次重复叠加了一个add值,这样就可能将最小值覆盖.所以我们在pushdown操作的时候应该注意如…

FFF at Valentine Time Limit: 6000/3000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 1060    Accepted Submission(s): 506 Problem Description At Valentine's eve, Shylock and Lucar were enjoying their time as any oth…

Dying Light Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 131072/131072 K (Java/Others)Total Submission(s): 513    Accepted Submission(s): 122 Problem Description LsF is visiting a local amusement park with his friends, and a mirror room su…

CSGO Time Limit: 20000/10000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 127    Accepted Submission(s): 20 Problem Description Senior Pan is crazy about CSGO and she is so skilled. She can kill every enemy she sp…

Ch’s gift Time Limit: 6000/3000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 1354    Accepted Submission(s): 496 Problem Description Mr. Cui is working off-campus and he misses his girl friend very much. After a w…

Big binary tree Time Limit: 4000/2000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 597    Accepted Submission(s): 207 Problem Description You are given a complete binary tree with n nodes. The root node is numbere…