2022BPhO英国物理奥赛，2022备赛报名倒计时！
BPhO英国物理奥赛 始于1979年，1983年正式为英国选拔国家代表队参与国际物理学术活动。该学术活动也被称为牛剑物理工程学子标配赛。英国物理奥赛非常注重物理知识的灵活运用，全部的试题为证明题。同学们需要运用...
USACO 2021 February Contest, Gold Problem 2. Modern Art 3
USACO 2021 February Contest, Gold Problem 2. Modern Art 3 Having become bored with standard 2-dimensional artwork (and also frustrated at others copying her work), the great bovine artist Picowso h...
USACO 2021 February Contest, Gold Problem 1. Stone Game
USACO 2021 February Contest, Gold Problem 1. Stone Game Bessie and Elsie are playing a game with NN (1≤N≤1051≤N≤105) piles of stones, where the ii-th pile has aiai stones for each 1≤i≤N1≤i≤N (1≤ai≤...
USACO 2021 February Contest, Platinum Problem 3. Counting Graphs
USACO 2021 February Contest, Platinum Problem 3. Counting Graphs Bessie has a connected, undirected graph GG with NN vertices labeled 1…N1…N and MM edges (2≤N≤102,N−1≤M≤N2+N22≤N≤102,N−1≤M≤N2+N2). G...
USACO 2021 February Contest, Platinum Problem 2. Minimizing Edges
USACO 2021 February Contest, Platinum Problem 2. Minimizing Edges Bessie has a connected, undirected graph GG with NN vertices labeled 1…N1…N and MM edges (2≤N≤105,N−1≤M≤N2+N22≤N≤105,N−1≤M≤N2+N2). ...
USACO 2021 US Open, Platinum Problem 3. Balanced Subsets
USACO 2021 US Open, Platinum Problem 3. Balanced Subsets Farmer John's pasture can be regarded as a large 2D grid of square "cells" (picture a huge chessboard) labeled by the ordered pairs (i,j)(i,...
USACO 2021 February Contest, Platinum Problem 1. No Time to Dry
USACO 2021 February Contest, Platinum Problem 1. No Time to Dry Bessie has recently received a painting set, and she wants to paint the long fence at one end of her pasture. The fence consists of N...
USACO 2021 January Contest, Bronze Problem 3. Just Stalling
USACO 2021 January Contest, Bronze Problem 3. Just Stalling Farmer John has NN cows (1≤N≤201≤N≤20) of heights a1…aNa1…aN. His barn has NN stalls with max height limits b1…bNb1…bN (so for example, i...
USACO 2021 January Contest, Bronze Problem 2. Even More Odd Photos
USACO 2021 January Contest, Bronze Problem 2. Even More Odd Photos Farmer John is yet again trying to take a photograph of his NN cows (2≤N≤10002≤N≤1000). Each cow has an integer "breed ID" number ...
