题目链接:poj3468 题意:给定一段数组,有两种操作,一种是给某段区间加c,另一种是查询一段区间的和 思路:暴力的方法是每次都给这段区间的点加c,查询也遍历一遍区间,复杂度是n*n,肯定过不去,另一种思路是用线段树记录区间的和,每次查询的复杂度是lgn,修改不必更新到每个点,当某个区间全被修改时,我们可以给它加一个懒惰标记,表示这个区间的所有下面节点都需要更新,只是因为现在不需要使用而暂时没有更新.这样修改的复杂度也降到了lgn ac代码: #include <iostream> #inc…

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…

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…

洛谷P3372 //线段树 询问区间和,支持区间修改 #include <cstdio> using namespace std; struct treetype { int l,r; long long sum,d; }; ; treetype a[maxn<<]; long long num[maxn]; void build(int k,int l,int r) { a[k].l=l;a[k].r=r;a[k].d=; if (a[k].l==a[k].r) { a[k].s…

A Simple Problem with Integers Time Limit: 5000MS   Memory Limit: 131072K Total Submissions: 97196   Accepted: 30348 Case Time Limit: 2000MS Description You have N integers, A1, A2, ... , AN. You need to deal with two kinds of operations. One type of…

A Simple Problem with Integers Time Limit: 5000MS   Memory Limit: 131072K Total Submissions: 92127   Accepted: 28671 Case Time Limit: 2000MS 描述 You have N integers, A1, A2, ... , AN. You need to deal with two kinds of operations. One type of operatio…

题目地址http://poj.org/problem?id=3468 题目大意很简单,有两个操作,一个 Q a, b 查询区间[a, b]的和 C a, b, c让区间[a, b] 的每一个数+c 第一次线段树的延时标记,花了好大的功夫才写好==! 很容易看出来使用使用线段树记录区间的和,但是难点在于每次修改的是一个区间而不是一个点 所以采用的方法就是每次做修改操作时,只将区间［a,b］的标记+c,而不是真正意义上的将区间[a, b] 的每一个值+c. 而当我们做查询操作时,就只需要将区间[a,…

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…

A Simple Problem with Integers Time Limit: 5000MS   Memory Limit: 131072K Total Submissions: 92921   Accepted: 28910 Case Time Limit: 2000MS Description You have N integers, A1, A2, ... , AN. You need to deal with two kinds of operations. One type of…

转载请注明出处:http://blog.csdn.net/u012860063 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 th…