原题下载 USACO2015JAN-B2 答案 (Analysis by Mark Gordon) This problem is a harder version of the Cow Routing problem that appeared earlier in the bronze contest. In this problem Bessie may use up to...
原题下载 USACO2015JAN-B1 答案 (Analysis by Mark Gordon) This problem asks us to find the minimum cost route that allows us to fly from city A to city B. This is a relatively straightforward problem...
原题下载 USACO2014DEC-B4 答案: (Analysis by Jonathan Paulson - jonathanpaulson@gmail.com) The main difficulty here is that A and B are so large we cannot consider each new cow separately. We have t...
原题下载 USACO2014-DEC-S2 答案 (Analysis by Nick Wu) Let's define f(n,k)f(n,k) to be the smallest distance needed to end up at point nn having skipped exactly kk points. Given that we are at a spec...
原题下载 USACO2014-DEC-G3 答案 (Analysis by Mark Gordon) Two cows must be in different lanes if one cow overtakes the other at some point (or at the very end) in the jog. Viewed this way we can gre...
原题下载 USACO2014-DEC-G2 答案 (Analysis by Allen Chen) Seeing that we have to update point coordinates and query the minimum travel time for a sub-route, we immediately see that this problem invol...
原题下载 USACO2014-DEC-G1 答案 (Analysis by Bill Cooperman) An initial observation for many experienced contestants is that there can be no more than 20 cows. Immediately this suggests some solutio...
原题下载 USACO2014-DEC-S3 答案 (Analysis by Jonathan Paulson - jonathanpaulson@gmail.com) If the cows didn't have to slow down, after TT seconds cow ii will be at position xi+T∗sixi+T∗si. If a fast...
答案 (Analysis by Jonathan Paulson - jonathanpaulson@gmail.com) The first step is to see that we can break Bessie and Elsie's trip into two parts: the start until they meet and piggyback, and then ...
