OpenJudge

702:Crossing River

总时间限制:
1000ms
内存限制:
65536kB
描述
A group of N people wishes to go across a river with only one boat, which can at most carry two persons. Therefore some sort of shuttle arrangement must be arranged in order to row the boat back and forth so that all people may cross. Each person has a different rowing speed; the speed of a couple is determined by the speed of the slower one. Your job is to determine a strategy that minimizes the time for these people to get across.
输入
The first line of the input contains a single integer T (1 <= T <= 20), the number of test cases. Then T cases follow. The first line of each case contains N, and the second line contains N integers giving the time for each people to cross the river. There won't be more than 1000 people and nobody takes more than 100 seconds to cross.
输出
For each test case, print a line containing the total number of seconds required for all the N people to cross the river.
样例输入
1
4
1 2 5 10
样例输出
17
来源
POJ Monthly--2004.07.18
全局题号
702
添加于
2015-11-17
提交次数
651
尝试人数
213
通过人数
190