### Author Topic: 多少组发生了争吵  (Read 8602 times)

#### DAV

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• Posts: 8
##### 多少组发生了争吵
« on: 八月 01, 2012, 11:56:07 pm »

#### 万精油

• Hero Member
• Posts: 1831
##### Re: 多少组发生了争吵
« Reply #1 on: 八月 03, 2012, 12:18:12 am »

#### DAV

• Newbie
• Posts: 8
##### Re: 多少组发生了争吵
« Reply #2 on: 八月 03, 2012, 03:15:37 am »

« Last Edit: 八月 03, 2012, 03:20:24 am by DAV »

#### 万精油

• Hero Member
• Posts: 1831
##### Re: 多少组发生了争吵
« Reply #3 on: 八月 07, 2012, 09:36:38 am »

K*(K-1)*(N-K)*(N-K-1)/4

#### DAV

• Newbie
• Posts: 8
##### Re: 多少组发生了争吵
« Reply #4 on: 八月 08, 2012, 12:21:15 pm »

#### 万精油

• Hero Member
• Posts: 1831
##### Re: 多少组发生了争吵
« Reply #5 on: 八月 12, 2012, 08:45:52 am »

5等分后，吵架个数是：8538560
3等分后，吵架个数是：7488000
2等分后，吵架个数是：3132900

#### DAV

• Newbie
• Posts: 8
##### Re: 多少组发生了争吵
« Reply #6 on: 八月 18, 2012, 09:25:17 am »

5等分后，吵架个数是：8538560
3等分后，吵架个数是：7488000
2等分后，吵架个数是：3132900
5等分为最佳解是对的，不过吵架个数貌似算错了，但这也无关大雅。

#### DAV

• Newbie
• Posts: 8
##### Re: 多少组发生了争吵
« Reply #7 on: 八月 18, 2012, 09:29:18 am »

In the Padurea forest there are 100 rest stops. There are 1000 trails, each connecting a pair of rest stops. Each trail e has a level of difficulty l(e). No two trails have the same difficulty. An intrepid hiker, Sendeirismo has decided to spend a vacation by taking a hike consisting of 20 trails of ever increasing difficulty.
Can he be sure that it can be done?

He is free to choose the starting rest stop and the 20 trails from a sequence where the start of one trail is the end of a previous one.