USACO 2.3 Zero Sum 零的算式和 解题报告
Zero Sum
Consider the sequence of digits from 1 through N (where N=9) in increasing order: 1 2 3 … N.
Now insert either a ‘+’ for addition or a ‘-‘[……]
Zero Sum
Consider the sequence of digits from 1 through N (where N=9) in increasing order: 1 2 3 … N.
Now insert either a ‘+’ for addition or a ‘-‘[……]
Farmer John is considering purchasing a new herd of cows. In this new herd, each mother cow gives birth to two children. The relationships among the c[……]
Money Systems
The cows have not only created their own government but they have chosen to create their own money system. In their own rebellious way,[……]
Broken Necklace
You have a necklace of N red, white, or blue beads (3<=N<=350) some of which are red, others blue, and others white, arranged at[……]
Controlling Companies
Some companies are partial owners of other companies because they have acquired part of their total shares of stock. For examp[......]
The Tamworth Two
BIO \'98 - Richard Forster
A pair of cows is loose somewhere in the forest. Farmer John is lending his expertise to their capt[......]
Cow Tours
Farmer John has a number of pastures on his farm. Cow paths connect some pastures with certain other pastures, forming a field. But, at the[......]
USACO 2.4 Overfencing 穿越栅栏
Overfencing
Kolstad and Schrijvers
Farmer John went crazy and created a huge maze of fences out in a field. Happily, he[......]
USACO 2.2 Subset Sums集合
For many sets of consecutive integers from 1 through N (1 <= N <= 39), one can partition the set into two sets whose sum[……]
Packing Rectangles 铺放矩形块 (IOI 95)
在网上看了挺多解释这一题的文章,总感觉没看大懂,所以自己写一篇文章吧。希望能够帮助大家理解一下这一题。题目如下:
http://www.nocow.cn/index.php/Translate:USACO/packrec
开始拿到题[……]