2008年北京賽區(qū)賽題 1 Problem A. Destroying the bus stations 3 Problem B. A simple stone game 9 Problem C. Ugly Windows 16 Problem D. Tornado 25 Problem E. Minimal Ratio Tree 32 Problem F. Parade 37 Problem G. Priest John's Busiest Day 44 Problem H. Ping pong 49 Problem I. Timer 53 Problem J. Elevator 59 2009年寧波賽區(qū)賽題 73 Problem A. Facer is learning to swim 75 Problem B. Zombies VS Plants 84 Problem C. Seat taking up is tough 96 Problem D. Ancient vending machine 105 Problem E. Open-air shopping malls 116 Problem F. Posters 122 Problem G. Hamlet’s gambling 128 Problem H. Graph Game 136 Problem I. Columbus’s bargain 144 Problem J. P2P File Sharing System 150 2010年杭州賽區(qū)賽題 157 Problem A. Naughty fairies 159 Problem B. Prison Break 171 Problem C. To Be an Dream Architect 180 Problem D. Gomoku 186 Problem E. Gunshots 195 Problem F. Rotational Painting 210 Problem G. Traffic Real Time Query System 219 Problem H. National Day Parade 229 Problem I. Searchlights 234 Problem J. Infinite monkey theorem 243 2010年福州賽區(qū)賽題 249 Problem A. Knight's Problem 251 Problem B. Nubulsa Expo 260 Problem C. Shade of Hallelujah Mountain 267 Problem D. Math teacher's homework 275 Problem E. Fermat Point in Quadrangle 283 Problem F. Computer Virus on Planet Pandora 288 Problem G. Farm Game 296 Problem H. Selecting courses 303 Problem I. Let the light guide us 308 Problem J. A hard Aoshu Problem 316