今天学了很多关于树状数组的技巧.一个是利用树状数组可以简单的实现段更新,点询问(二维的段更新点询问也可以),每次修改只需要修改2个角或者4个角就可以了,另外一个技巧就是这题,原本用线段树做,现在可以用树状数组做的题,只需多维护一个bit即可.具体的思路见下面的链接: http://hi.baidu.com/billdu/item/053f6a15ca301b0a8ebde400 要理解里面的橙色块求的时候是打竖看的,不是打横看的. #pragma warning(disable:4996) #i…

You have N integers, A1, A2, ... , AN. You need to deal with two kinds of operations. One type of operation is to add some given number to each number in a given interval. The other is to ask for the sum of numbers in a given interval. Input The firs…

poj3468 A Simple Problem with Integers 题意:O(-1) 思路:O(-1) 线段树功能:update:成段增减 query:区间求和 Sample Input 10 5 1 2 3 4 5 6 7 8 9 10 Q 4 4 Q 1 10 Q 2 4 C 3 6 3 Q 2 4 Sample Output 4 55 9 15 Hint The sums may exceed the range of 32-bit integers. 题目大意:   N个数 M…

A Simple Problem with Integers Time Limit: 5000/1500 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 4494 Accepted Submission(s): 1384 Problem Description Let A1, A2, - , AN be N elements. You need to deal with two kin…

题目传送门 A Simple Problem with Integers Time Limit: 5000MS   Memory Limit: 131072K Total Submissions: 130735   Accepted: 40585 Case Time Limit: 2000MS Description You have N integers, A1, A2, ... , AN. You need to deal with two kinds of operations. One…

A Simple Problem with Integers Time Limit: 5000MS   Memory Limit: 131072K Total Submissions: 79137   Accepted: 24395 Case Time Limit: 2000MS Description You have N integers, A1, A2, ... , AN. You need to deal with two kinds of operations. One type of…

Description You have N integers, A1, A2, ... , AN. You need to deal with two kinds of operations. One type of operation is to add some given number to each number in a given interval. The other is to ask for the sum of numbers in a given interval. In…

题意:给一个序列,操作1:给区间[a,b]中(i-a)%k==0的位置 i 的值都加上val  操作2:查询 i 位置的值 解法:树状数组记录更新值. 由 (i-a)%k == 0 得知 i%k == a%k,又因为k <= 10,想到建55棵树状数组,即对每个(k,x%k)都建一棵树状数组,每次更新时,在第(k,a%k)棵树状数组上更新a这个点,更新值为val,然后再b+1处更新值为-val,即在[a,b]内更新了val. 查询pos的时候,求出每一个树状数组(k,pos%k)的sum值即可.…

https://vjudge.net/problem/POJ-3468 线段树区间更新(lazy数组)模板题 #include<iostream> #include<cstdio> #include<queue> #include<cstring> #include<algorithm> #include<cmath> #include<map> #define lson l, m, rt<<1 #define…

Description You have N integers, A1, A2, ... , AN. You need to deal with two kinds of operations. One type of operation is to add some given number to each number in a given interval. The other is to ask for the sum of numbers in a given interval. In…