Elevator (20)

本文深入探讨了一种电梯调度算法的实现细节,通过分析电梯在不同楼层间的移动成本,计算出完成一系列请求所需的总时间。文章提供了一个具体的代码示例,展示了如何根据电梯上行和下行的耗时差异来优化电梯调度,确保高效地处理所有楼层请求。

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Elevator (20)

时间限制 1000 ms 内存限制 32768 KB 代码长度限制 100 KB 判断程序 Standard (来自 小小)

题目描述

The highest building in our city has only one elevator. A request list is made up with N positive numbers. The numbers denote at which floors the elevator will stop, in specified order. It costs 6 seconds to move the elevator up one floor, and 4 seconds to move down one floor. The elevator will stay for 5 seconds at each stop.
For a given request list, you are to compute the total time spent to fulfill the requests on the list. The elevator is on the 0th floor at the beginning and does not have to return to the ground floor when the requests are fulfilled.

 

输入描述:

Each input file contains one test case. Each case contains a positive integer N, followed by N positive numbers. All the numbers in the input are less than 100.


 

输出描述:

For each test case, print the total time on a single line.

 

输入例子:

3 2 3 1

 

输出例子:

41
#include<stdio.h>
int main()
{
	int n,i,sum;
	int a[105]; 
	scanf("%d",&n);
	for(i=0;i<n;i++)
		scanf("%d",&a[i]);
	sum=6*a[0]+5;
	for(i=1;i<n;i++)
	{
		if(a[i]>a[i-1])
		   sum+=(a[i]-a[i-1])*6+5;
		else
		 sum+=(a[i-1]-a[i])*4+5;
	}
	printf("%d\n",sum);
	return 0;
} 

太水了。。。。还是记录一下吧

按照你的方案 我加了索引 索引信息如下 mysql> SHOW INDEX FROM md_elevator_mode_switch_record_transfer; +-----------------------------------------+------------+-----------------+--------------+-----------------+-----------+-------------+----------+--------+------+------------+---------+---------------+ | Table | Non_unique | Key_name | Seq_in_index | Column_name | Collation | Cardinality | Sub_part | Packed | Null | Index_type | Comment | Index_comment | +-----------------------------------------+------------+-----------------+--------------+-----------------+-----------+-------------+----------+--------+------+------------+---------+---------------+ | md_elevator_mode_switch_record_transfer | 0 | PRIMARY | 1 | id | A | 2200838 | NULL | NULL | | BTREE | | | | md_elevator_mode_switch_record_transfer | 1 | elevator_id | 1 | elevator_id | A | 23664 | NULL | NULL | YES | BTREE | | | | md_elevator_mode_switch_record_transfer | 1 | event_config_id | 1 | event_config_id | A | 2674 | NULL | NULL | YES | BTREE | | | | md_elevator_mode_switch_record_transfer | 1 | happened_time | 1 | happened_time | A | 2200838 | NULL | NULL | YES | BTREE | | | | md_elevator_mode_switch_record_transfer | 1 | serial_number | 1 | serial_number | A | 2200838 | NULL | NULL | YES | BTREE | | | | md_elevator_mode_switch_record_transfer | 1 | idx_event_time | 1 | event_config_id | A | 993 | 20 | NULL | YES | BTREE | | | | md_elevator_mode_switch_record_transfer | 1 | idx_event_time | 2 | happened_time | A | 2200838 | NULL | NULL | YES | BTREE | | | | md_elevator_mode_switch_record_transfer | 1 | idx_event_time | 3 | elevator_id | A | 2200838 | 64 | NULL | YES | BTREE | | | | md_elevator_mode_switch_record_transfer | 1 | idx_event_time | 4 | serial_number | A | 2200838 | 64 | NULL | YES | BTREE | | | +-----------------------------------------+------------+-----------------+--------------+-----------------+-----------+-------------+----------+--------+------+------------+---------+---------------+ 9 rows in set (0.06 sec) mysql> SHOW INDEX FROM view_terminal_jinshan_sh_table; +--------------------------------+------------+-------------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+ | Table | Non_unique | Key_name | Seq_in_index | Column_name | Collation | Cardinality | Sub_part | Packed | Null | Index_type | Comment | Index_comment | +--------------------------------+------------+-------------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+ | view_terminal_jinshan_sh_table | 0 | PRIMARY | 1 | elevator_id | A | 3491 | NULL | NULL | | BTREE | | | | view_terminal_jinshan_sh_table | 1 | terminal_id | 1 | terminal_id | A | 3491 | NULL | NULL | | BTREE | | | +--------------------------------+------------+-------------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+ 2 rows in set (0.00 sec) EXPLAIN SELECT memsc.happened_time AS "happenedTime", memsc.serial_number AS "serialNumber", memsc.elevator_id AS "elevatorId", memsc.event_config_id AS "eventConfigId", view1.terminal_id AS "terminalId" FROM md_elevator_mode_switch_record_transfer memsc INNER JOIN view_terminal_jinshan_sh_table view1 ON memsc.elevator_id = view1.elevator_id -- 使用电梯ID连接 LEFT JOIN om_record_ysy ory ON ory.event_id = memsc.serial_number WHERE memsc.event_config_id IN ('491','492','493') AND memsc.happened_time BETWEEN DATE_SUB(NOW(), INTERVAL 30 MINUTE) AND DATE_SUB(NOW(), INTERVAL 10 MINUTE) AND ory.event_id IS NULL -- 替换NOT EXISTS ORDER BY memsc.happened_time DESC;使用这个sql语句还是很慢 需要20秒以上 下面是explain结果 1 SIMPLE view1 index PRIMARY terminal_id 77 3491 Using index; Using temporary; Using filesort 1 SIMPLE memsc ref elevator_id,event_config_id,happened_time,idx_event_time elevator_id 387 smartelevatorguard.view1.elevator_id 93 Using index condition; Using where 1 SIMPLE ory ref event_id event_id 194 smartelevatorguard.memsc.serial_number 1 Using where; Not exists; Using index
最新发布
06-11
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