Problem Nice boat(HDU 4902) 题目大意 维护一个序列,两种操作. 第一种操作,将一段区间[l,r]赋值为x. 第二种操作,将一段区间[l,r]中大于等于x的数与x求gcd. 询问所有操作结束后的序列. 解题分析 用线段树开一个标记same,表示这段区间中的数是否相同,若相同则为该数,否则为-1. 对于第二种操作,对于覆盖区间内的same不为-1的子区间暴力修改. 虽然时限有15s,但貌似跑得挺快的,只用了1s,不知是数据水还是什么缘故. 参考程序 #include <c…

http://acm.hdu.edu.cn/showproblem.php?pid=4902 出n个数,然后对这n个数进行两种操作: 如果是 1 l r x,则把 [l, r] 区间里面的每一个数都变为x: 如果是 2 l r x,则 比较 [l, r]区间里的数a_i和x的大小,如果a_i > x,把a_i变为a_i和x的最大公约数. 最后输出这n个数最终的值. 线段树可搞...但是没必要!... 线段树,每个结点多一个lazy表示该位置以下区间是否数字全相同,然后每次延迟操作,最后输出的时候…

Weak Pair Time Limit: 4000/2000 MS (Java/Others)    Memory Limit: 262144/262144 K (Java/Others)Total Submission(s): 439    Accepted Submission(s): 155 Problem Description You are given a rooted tree of N nodes, labeled from 1 to N. To the ith node a…

Assign the task Time Limit: 15000/5000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 1647    Accepted Submission(s): 753 Problem Description There is a company that has N employees(numbered from 1 to N),every emplo…

Queue-jumpers Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 3348    Accepted Submission(s): 904 Problem Description Ponyo and Garfield are waiting outside the box-office for their favorite mo…

Sequence operation Time Limit: 10000/5000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 7502    Accepted Submission(s): 2233 Problem Description lxhgww got a sequence contains n characters which are all '0's or '1…

Transformation Time Limit: 15000/8000 MS (Java/Others)    Memory Limit: 65535/65536 K (Java/Others) Total Submission(s): 4095    Accepted Submission(s): 1008 Problem Description Yuanfang is puzzled with the question below:  There are n integers, a1,…

威威猫系列故事——晒被子 Time Limit: 3000/1000 MS (Java/Others)    Memory Limit: 65535/32768 K (Java/Others) Total Submission(s): 1592    Accepted Submission(s): 444 Problem Description 因为马拉松初赛中吃鸡腿的题目让不少人抱憾而归,威威猫一直觉得愧对大家,这几天他悄悄搬到直角坐标系里去住了. 生活还要继续,太阳也照常升起,今天,威威猫在…

Memory Control Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 5913    Accepted Submission(s): 1380 Problem Description Memory units are numbered from 1 up to N. A sequence of memory units is c…

Adding New Machine Time Limit: 10000/5000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 1428    Accepted Submission(s): 298 Problem Description Incredible Crazily Progressing Company (ICPC) suffered a lot with the…