2016

POI2013 Polarization

POI
想法, 树的重心, 背包

POI2013 Inspector

POI
二分, 想法

POI2013 Where is the one

POI
二分

POI2013 Multidrink

POI
构造

POI2013 Tower Defense game

POI
想法

POI2013 Watering can

POI
BIT, 线段树

POI2013 Colorful Chain

POI
hash

POI2013 Take-out

POI
想法

POI2013 Taxis

POI
贪心

POI2013 Triumphal arch

POI
二分, 贪心