算是线段树中的一道水题了,必须用到懒操作,否则会超时.或者也可以刚开始不计算和,只更新节点,最后算整个线段的颜色和. 1.懒操作法 /* 908ms 3448KB in HDU OJ*/ #include <iostream> #include <cstdio> #include <cstring> #include <cmath> #include <algorithm> #include <cstdlib> using names…

题目链接 题意 : 一个有n段长的金属棍,开始都涂上铜,分段涂成别的,金的值是3,银的值是2,铜的值是1,然后问你最后这n段总共的值是多少. 思路 : 线段树的区间更新.可以理解为线段树成段更新的模板题. //HDU 1698 #include <cstdio> #include <cstring> #include <iostream> using namespace std; ],p[] ; //lz延迟标记,每次更新不需要更新到底,使得更新延迟到下次更新或者查询的…

2017-08-30 18:54:40 writer:pprp 可以跟上一篇博客做个对比, 这种实现不是很好理解,上一篇比较好理解,但是感觉有的地方不够严密 代码如下: /* @theme:segmentation/interval T @writer:pprp @begin:15:26 @end:16:13 @declare: 使用lazy标记的线段树,HDU 1698 这次写的是带结构体的那种 @date:2017/8/30 */ #include <iostream> #include…

Just a Hook Time Limit:2000MS     Memory Limit:32768KB     64bit IO Format:%I64d & %I64u Submit Status Practice HDU 1698 Description In the game of DotA, Pudge’s meat hook is actually the most horrible thing for most of the heroes. The hook is made u…

题目地址:pid=1698">HDU 1698 区间替换裸题.相同利用lazy延迟标记数组,这里仅仅是当lazy下放的时候把以下的lazy也所有改成lazy就好了. 代码例如以下: #include <iostream> #include <cstdio> #include <string> #include <cstring> #include <stdlib.h> #include <math.h> #includ…

Just a Hook (HDU 1698) 题链 每一次都将一个区间整体进行修改,需要用到懒惰标记,懒惰标记的核心在于在查询前才更新,比如将当前点rt标记为col[rt],那么此点的左孩子和右孩子标记必然和其一致(直接替换,如果是累积则另当别论),同时这个区间也能很快求出了 线段树功能:区间更新+区间查询 #include <cstdio> #include <utility> #include <queue> #include <cstring> #de…

题目链接 HDU 1698 Problem Description: In the game of DotA, Pudge’s meat hook is actually the most horrible thing for most of the heroes. The hook is made up of several consecutive metallic sticks which are of the same length. Now Pudge wants to do some…

题目网址:http://acm.hdu.edu.cn/showproblem.php?pid=1698 题目: Problem Description   In the game of DotA, Pudge's meat hook is actually the most horrible thing for most of the heroes. The hook is made up of several consecutive metallic sticks which are of t…

Just a Hook Time Limit: 1 Sec  Memory Limit: 256 MB 题目连接 http://acm.hdu.edu.cn/showproblem.php?pid=1698 Description In the game of DotA, Pudge’s meat hook is actually the most horrible thing for most of the heroes. The hook is made up of several cons…

http://acm.hdu.edu.cn/showproblem.php?pid=1698 题意:给出1~n的数,每个数初始为1,每次改变[a,b]的值,最后求1~n的值之和. 思路: 区间更新题目,关于懒惰标记什么的参考这个吧http://blog.sina.com.cn/s/blog_a2dce6b30101l8bi.html,讲得不错的. #include<iostream> #include<cstring> #include<algorithm> using…

acm.hdu.edu.cn/showproblem.php?pid=1698 [AC] #include<cstdio> ; #define lson (i<<1) #define rson (i<<1|1) struct Seg { int l,r,lazy,val; }tree[maxn<<]; int val[maxn]; void push_up(int i) { tree[i].val=tree[lson].val+tree[rson].val;…

题目连接: http://acm.hdu.edu.cn/showproblem.php?pid=1698 题目大意: 有一个钩子有n条棍子组成,棍子有铜银金三种组成,价值分别为1,2,3.为了对付每场战斗需要对组成钩子某个区间的棍子进行调整.问经过q次调整后钩子的总价值是多少? 解题思路: 线段树更新.因为数据范围的问题,每次更新到节点会TLE.用区间更新就会节省很多的时间,对每一个区间来讲,如果这个区间里面的棍子都是相同类型的,就用一个节点变量记录棍子类型,如果区间内棍子是不同类型,则将变量记…

Just a Hook [题目链接]Just a Hook [题目类型]线段树 区间替换 &题解: 线段树 区间替换 和区间求和 模板题 只不过不需要查询 题里只问了全部区间的和,所以seg[1] 就是answer [时间复杂度]\(O(nlogn)\) &代码: #include <bits/stdc++.h> using namespace std; const int maxn = 100000 + 9 ; int n,q,x,y,z; int seg[maxn<&…

题目链接: 传送门 Minimum Inversion Number Time Limit: 1000MS     Memory Limit: 32768 K Description In the game of DotA, Pudge's meat hook is actually the most horrible thing for most of the heroes. The hook is made up of several consecutive metallic sticks…

Just a Hook Time Limit: 4000/2000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 15129    Accepted Submission(s): 7506 Problem Description In the game of DotA, Pudge’s meat hook is actually the most horrible thing f…

Just a Hook Time Limit: 4000/2000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 27359    Accepted Submission(s): 13593 Problem Description In the game of DotA, Pudge’s meat hook is actually the most horrible thing…

Just a Hook Time Limit: 4000/2000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 23229    Accepted Submission(s): 11634 Problem Description In the game of DotA, Pudge’s meat hook is actually the most horrible thing…

题意:初始1-n 值为1,有Q操作,每次可以把一段[l,r] 整段每个值变成 x,问最后的[1,n]总和. 线段树成段更新(基础题) #include<cstdio> #include<cstring> #include<algorithm> #include<cmath> #include <iostream> #define L(x) (x<<1) #define R(x) (x<<1|1) #define debug…

有m个操作,每个操作 X Y Z是将区间[X, Y]中的所有的数全部变为Z,最后询问整个区间所有数之和是多少. 区间更新有一个懒惰标记,set[o] = v,表示这个区间所有的数都是v,只有这个区间被分开的时候再往下传递. #include <cstdio> + ; ], ]; int n, qL, qR, m, v; void build(int o, int L, int R) { ; ; return; } ; build(o*, L, M); build(o*+, M+, R); su…

题目链接 题意: n个挂钩,q次询问,每个挂钩可能的值为1 2 3,  初始值为1,每次询问 把从x到Y区间内的值改变为z.求最后的总的值. 分析:用val记录这一个区间的值,val == -1表示这个区间值不统一,而且已经向下更新了, val != -1表示这个区间值统一, 更新某个区间的时候只需要把这个区间分为几个区间更新就行了, 也就是只更新到需要更新的区间,不用向下更新每一个一直到底了,在更新的过程中如果遇到之前没有向下更新的, 就需要向下更新了,因为这个区间的值已经不统一了. 其实这就…

lazy标记 #include <iostream> #include <cstdio> #include <cstring> #include <sstream> #include <string> #include <algorithm> #include <list> #include <map> #include <vector> #include <queue> #includ…

某个英雄有这样一个金属长棍,这个金属棍有很多相同长度的短棍组成,大概最多有10w节,现在这个人有一种魔法,他可以把一段区间的金属棍改变成别的物质,例如金银或者铜, 现在他会有一些操作在这个金属棍上,他想知道这些操作结束后金属棍的质量是多少呢?(PS,一节铜重量1, 银 2 ,金3). 分析:如果做了那到海报覆盖的题目会发现这两题是差不多的,都可以从后面往前去覆盖,只不过返回这次能覆盖多少节就行了. *************************************************…

Just a Hook Time Limit: 4000/2000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 18378    Accepted Submission(s): 9213 Problem Description In the game of DotA, Pudge’s meat hook is actually the most horrible thing f…

成段更新,需要用到延迟标记(或者说懒惰标记),简单来说就是每次更新的时候不要更新到底,用延迟标记使得更新延迟到下次需要更新or询问到的时候. 此处建议在纸上模拟一遍. Problem Description In the game of DotA, Pudge’s meat hook is actually the most horrible thing for most of the heroes. The hook is made up of several consecutive meta…

Just a Hook                                                                             Time Limit: 4000/2000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Problem Description In the game of DotA, Pudge's meat hook is actually the mos…

Problem Description In the game of DotA, Pudge's meat hook is actually the most horrible thing for most of the heroes. The hook is made up of several consecutive metallic sticks which are of the same length. Now Pudge wants to do some operations on t…

成段更新的线段树,加入了延时标记............ 线段树这种东西细节上的理解因人而异,还是要自己深入理解......慢慢来 #include <iostream> #include <algorithm> #include <cmath> #include <cstdio> #include <cstdlib> #include <cstring> #include <string> #include <ve…

Description: In the game of DotA, Pudge’s meat hook is actually the most horrible thing for most of the heroes. The hook is made up of several consecutive metallic sticks which are of the same length. Now Pudge wants to do some operations on the hook…

Just a Hook Time Limit: 4000/2000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 30553    Accepted Submission(s): 15071 Problem Description In the game of DotA, Pudge's meat hook is actually the most horrible thing…

题意  给出一段初始化全为1的区间  后面可以一段一段更改成 1 或 2 或3 问最后整段区间的和是多少 思路:标准线段树区间和模版题 #include<cstdio> #include<algorithm> #include<set> #include<vector> #include<cstring> #include<iostream> using namespace std; ; struct Node{ int l,r,su…