== ZOJ ==
这是浙江大学判题系统：http://acm.zju.edu.cn/ 上的一些题目和它们的参考解答：

 * [[zju1001]] A + B Problem (AC)
 * [[zju1002]] Fire Net (AC)
 * [[zju1003]] Crashing Balloon
 * [[zju1006]] Do the Untwist (AC)
 * [[zju1094]] Matrix Chain Multiplication (AC)
 * [[zju1099]] HTML
 * [[zju1108]] FatMouse's Speed
 * [[zju1113]] u Calculate e (AC)
 * [[zju1115]] Digital Roots
 * [[zju1119]] SPF [图论] (AC)
 * [[zju1157]] A Plug for UNIX [图论] (AC)
 * [[zju1168]] Function Run Fun (AC)
 * [[zju1171]] Sorting the Photos (AC)
 * [[zju1221]] Risk [图论] (AC)
 * [[zju1235]] DDR King
 * [[zju1239]] Hanoi Tower Troubles Again! (AC)
 * [[zju1268]] Is It A Tree? [图论] (AC)
 * [[zju1347]] Determine the Price
 * [[zju1394]] Polar Explorer
 * [[zju1575]] Koch Curve (AC)
 * [[zju1798]] Granny's Bike ［图论］(AC)
 * [[zju1904]] Beavergnaw
 * [[zju1949]] Error Correction (AC)
 * [[zju1954]] Bee Maja (AC)
 * [[zju2104]] Let the Balloon Rise (AC)
 * [[zju2105]] Number Sequence (AC)
 * [[zju2106]] Tick and Tick
 * [[zju2107]] Quoit Design
 * [[zju2108]] Elevator (AC)
 * [[zju2109]] FatMouse' Trade (AC)
 * [[zju2110]] Tempter of the Bone
 * [[zju2111]] Starship Troopers
 * [[zju2290]] Game (AC)
 * [[zju2305]] C Looooops
 * [[zju2329]] AB Circle (AC)
 * [[zju2391]] Link and Pop -- the Block Game
 * [[zju2475]] Benny's Compiler (AC) ［图论］
 * [[zju2476]] Total Amount
 * [[zju2478]] Encoding
 * [[zju2480]] Simplest Task in Windows
 * [[zju2481]] Unique Ascending Array (AC)
 * [[zju2535]] Ancient Relics
 * [[zju2536]] Best Balance
 * [[zju2537]] Collect More Jewels
 * [[zju2538]] Dimensional Lookup
 * [[zju2539]] Energy Minimization
 * [[zju2540]] Form a Square
 * [[zju2541]] Goods Transportation (AC)
 * [[zju2542]] Html Link Resolver
 * [[zju2543]] Image Deskew
 * [[zju2722]] Head-to-Head Match (AC)
 * [[zju2723]] Semi-Prime (AC)
 * [[zju2724]] Windows Message Queue (AC)
 * [[zju2725]] Digital Deletions
 * [[zju2726]] Constellation
 * [[zju2727]] List the Books (AC)

== timus ==
以下是 http://acm.timus.ru/ 判题系统上的一些题目和参考解答
 * [[timus1005]] Stone Pile (AC)
 * [[timus1009]] K-Based Numbers
 * [[timus1012]] K-Based Numbers. Version 2
 * [[timus1028]] Stars (AC)
 * [[timus1052]] Rabbit hunt
 * [[timus1068]] Sum (AC)
 * [[timus1084]] A goat in a kitchen garden (AC)
 * [[timus1098]] Questions (AC)
 * [[timus1106]] Two Teams
 * [[timus1110]] Power
 * [[timus1180]] A Stone Game (AC)
 * [[timus1200]] Horns and Hoofs
 * [[timus1206]] Sum of digits
 * [[timus1209]] 1, 10, 100, 1000... (AC)
 * [[timus1220]] Stacks
 * [[timus1225]] Flags
 * [[timus1302]] Delta-wave
 * [[timus1313]] Some words about sport
 * [[timus1385]] Interesting Number
=== HDU ===
以下是杭州电子科技大学判题系统 http://acm.hdu.edu.cn/ 上的一些题目和它们的参考解答