USACO 2014 December Contest, Gold Problem 3. Cow Jog
原題下載 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...
USACO 2014 December Contest, Gold Problem 2. Marathon
原題下載 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...
USACO 2014 December Contest, Gold Problem 1. Guard Mark
原題下載 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...
USACO 2014 December Contest, Silver Problem 3. Cow Jog
原題下載 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...
USACO 2014 December Contest, Silver Problem 1. Piggyback
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 ...
USACO 2014 December Contest, Bronze Problem 3. Cow Jog
原題下載 USACO2014-DEC-B3 答案 (Analysis by Jonathan Paulson - jonathanpaulson@gmail.com) If a faster cow is behind a slower cow, the faster cow is eventually going to catch up and join the slower ...
USACO 2014 December Contest, Bronze Problem 2. Crosswords
原題下載 USACO2014DEC-B2 答案 (Analysis by Jonathan Paulson - jonathanpaulson@gmail.com) We can go along the squares in top-to-bottom, left-to-right order. For each square, we want to see if it sta...
USACO 2014 December Contest, Bronze Problem 1. Marathon
原題下載 USACO2014-DEC-B1 答案 (Analysis by Nick Wu) Our first instinct when trying to figure out which point to skip is to try all of them. If we choose to skip each point and compute the new dist...
2017AMC8真題及答案高清版（全網首發）
2017AMC8真題答案詳細解析請參考文末 ————————————————————————————————————————————— 翰林國際教育溫馨提示：2019美國數學學術活動AMC8初一初二年級組比賽將于2019年11月13日舉行，即日起—2019年10月20日，三到...
