思路来自题解(看着题解和标程瞎吉尔比划了半天) /* HDU 6059 - Kanade's trio [ 字典树 ]  |  2017 Multi-University Training Contest 3 题意: 给出数组 a[N],问满足 (i<j<k) && ((A[i] xor A[j])<(A[j] xor A[k])) 的三元组数数量 限制 N<=5e5, a[i] <= 2^30 分析: 对于某一对 ai, ak ,满足条件的 aj 为: 对于…

Kanade's trio Time Limit: 4000/2000 MS (Java/Others)    Memory Limit: 524288/524288 K (Java/Others)Total Submission(s): 960    Accepted Submission(s): 361 Problem Description Give you an array A[1..n],you need to calculate how many tuples (i,j,k) sat…

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 OwO http://acm.hdu.edu.cn/showproblem.php?pid=6059 解 由于每个数字最多是30位,枚举数字每一位考虑, 建一棵记录前缀(位的前缀,比如10拆成1010,那么就把1010从前往后插入这个字典树中)的字典树, nxt记录其后继,gcnt记录这个节点添加的个数,ng代表不符合要减去的个数(后文会提到) tol[i][j]代表第i位的j(j=0,1)当前数量 枚举Ak的每一位,对于Ak的第t位(记作Ak[t]) 1. 如果Ak[t]==1,那么对答案…

题目链接 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])) There are T test cases. 1≤T≤20 1≤∑n≤5∗105 0≤A[i]<230   Input There is only one integer…

Intelligent IME Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 4776    Accepted Submission(s): 2227 Problem Description We all use cell phone today. And we must be familiar with the intelligen…

Tree Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://acm.hdu.edu.cn/showproblem.php?pid=4757 Description Zero and One are good friends who always have fun with each other. This time, they decide to do something on a tree which is a kind of graph…

将斐波那契的前100000个,每个的前40位都插入到字典树里(其他位数删掉),然后直接查询字典树就行. 此题坑点在于 1.字典树的深度不能太大,事实上,超过40在hdu就会MLE…… 2.若大数加法时,保存的位数过少,就会导致低位误差,累积起来就可能导致前40位产生错误,解决办法是提高精度. #include<iostream> #include<cstring> #include<string> #include<cstdio> using namespa…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=1247 Problem DescriptionA hat’s word is a word in the dictionary that is the concatenation of exactly two other words in the dictionary.You are to find all the hat’s words in a dictionary. InputStandard…

http://acm.hdu.edu.cn/showproblem.php?pid=1251 题意:给出一些单词,然后有多次询问,每次输出以该单词为前缀的单词的数量. 思路: 字典树入门题. #include<iostream> #include<cstdio> #include<cstring> using namespace std; ; ; struct Trie { ]; int cnt; //前缀数量 int ends; //单词数量,在本题中其实并没有用到…