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| Online Judge | Problem Set | Authors | Online Contests | User | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Web Board Home Page F.A.Qs Statistical Charts | Current Contest Past Contests Scheduled Contests Award Contest | |||||||||
| ID | Title | Ratio(AC/submit) | Date |
| 1225 | STRICTLY INSCRIBED SIMILAR TRIANGLES | 19%(36/188) | May 27, 2026 |
| 1210 | City Directions | 11%(36/326) | Apr 3, 2026 |
| 1268 | Forests | 18%(51/277) | Dec 9, 2025 |
| 1232 | Microfiches | 17%(60/349) | Jun 3, 2026 |
| 1253 | Markov Trains | 13%(71/515) | Mar 21, 2026 |
| 1272 | Synchronous Design | 21%(94/446) | Nov 21, 2025 |
| 1246 | Hilbert Curve Intersections | 25%(97/375) | May 27, 2026 |
| 1233 | Street Crossing | 16%(103/617) | May 27, 2026 |
| 1224 | PICTURE PUZZLE | 22%(106/471) | Jun 3, 2026 |
| 1249 | Oil Pipeline | 25%(113/443) | May 28, 2026 |
| 1223 | DEHUFF | 31%(114/364) | May 27, 2026 |
| 1212 | Eeny Meeny | 30%(118/390) | Jul 19, 2026 |
| 1235 | Galactic Breakup | 34%(132/388) | May 27, 2026 |
| 1203 | Timetable | 22%(141/625) | Jul 19, 2026 |
| 1294 | Not Too Convex Hull | 21%(142/656) | May 28, 2026 |
| 1202 | Family | 17%(153/896) | May 27, 2026 |
| 1257 | Cross-stitch. | 32%(157/480) | Jun 8, 2026 |
| 1296 | Noise Effect | 39%(158/403) | May 28, 2026 |
| 1261 | Huffman Trees | 17%(164/964) | May 28, 2026 |
| 1278 | BOAT | 27%(171/625) | Jun 8, 2026 |
| 1216 | Simulation Wizardry | 53%(186/350) | Jul 19, 2026 |
| 1209 | Calendar | 17%(188/1068) | May 8, 2026 |
| 1288 | Sly Number | 36%(189/521) | May 28, 2026 |
| 1295 | I hate SPAM, but some people love it | 43%(190/436) | May 28, 2026 |
| 1213 | Roman Numerals | 48%(206/424) | Jun 26, 2026 |
| 1206 | Servers | 25%(206/796) | May 27, 2026 |
| 1255 | Floors | 35%(213/601) | May 28, 2026 |
| 1267 | Fence | 23%(222/948) | Jun 28, 2026 |
| 1242 | Plugged In | 43%(226/514) | May 27, 2026 |
| 1211 | Traffic Lights | 32%(228/695) | Jul 19, 2026 |
| 1227 | RoboContest | 32%(229/694) | May 27, 2026 |
| 1280 | Game | 32%(230/717) | Jun 8, 2026 |
| 1215 | Gondwanaland Telecom | 31%(234/747) | Jul 19, 2026 |
| 1290 | Grandpa's Rubik Cube | 51%(235/456) | May 28, 2026 |
| 1219 | L-I-N-G-O: LINGO | 21%(260/1222) | May 27, 2026 |
| 1238 | Arbitrage | 30%(282/912) | Jun 3, 2026 |
| 1277 | Beer Land | 46%(315/680) | Jun 8, 2026 |
| 1262 | Input | 42%(356/837) | Mar 26, 2026 |
| 1266 | Cover an Arc. | 38%(373/968) | May 28, 2026 |
| 1229 | Wild Domains | 33%(415/1228) | May 27, 2026 |
| 1282 | 庆典的日期 | 14%(419/2908) | Jul 4, 2026 |
| 1271 | Nice Milk | 22%(482/2150) | May 28, 2026 |
| 1259 | The Picnic | 29%(505/1730) | May 28, 2026 |
| 1217 | FOUR QUARTERS | 39%(522/1336) | May 27, 2026 |
| 1245 | Programmer, Rank Thyself | 35%(529/1477) | May 27, 2026 |
| 1264 | SCUD Busters | 40%(557/1385) | Mar 5, 2026 |
| 1263 | Reflections | 40%(571/1406) | May 28, 2026 |
| 1241 | Knockout Tournament | 59%(585/990) | May 27, 2026 |
| 1234 | Ball Toss | 42%(597/1395) | Jun 26, 2026 |
| 1291 | This Sentence is False | 44%(597/1330) | May 28, 2026 |
| 1292 | Will Indiana Jones Get There? | 26%(617/2362) | May 28, 2026 |
| 1237 | The Postal Worker Rings Once | 54%(618/1140) | Jun 26, 2026 |
| 1289 | The Cat in the Hat | 35%(655/1862) | May 30, 2026 |
| 1205 | Water Treatment Plants | 53%(661/1235) | Jul 19, 2026 |
| 1214 | "Accordian" Patience | 27%(664/2411) | Jul 19, 2026 |
| 1297 | Supermarket | 36%(684/1890) | May 28, 2026 |
| 1285 | Combinations, Once Again | 33%(724/2148) | May 28, 2026 |
| 1231 | The Alphabet Game | 41%(753/1824) | Jun 28, 2026 |
| 1244 | Slots of Fun | 57%(773/1334) | May 27, 2026 |
| 1293 | Duty Free Shop | 38%(867/2262) | May 28, 2026 |
| 1254 | Hansel and Grethel | 44%(1055/2366) | May 27, 2026 |
| 1283 | Moving Computer | 43%(1285/2947) | Jul 6, 2026 |
| 1299 | Polar Explorer | 34%(1543/4503) | May 28, 2026 |
| 1281 | MANAGER | 34%(1615/4732) | May 28, 2026 |
| 1240 | Pre-Post-erous! | 60%(1776/2931) | Jul 15, 2026 |
| 1243 | One Person | 64%(1884/2916) | Jun 24, 2026 |
| 1248 | Safecracker | 49%(2060/4134) | Nov 19, 2025 |
| 1252 | Euro Efficiency | 41%(2179/5193) | May 27, 2026 |
| 1239 | Increasing Sequences | 42%(2224/5222) | Jun 22, 2026 |
| 1221 | UNIMODAL PALINDROMIC DECOMPOSITIONS | 49%(2976/6062) | May 27, 2026 |
| 1220 | NUMBER BASE CONVERSION | 45%(3317/7360) | Jun 21, 2026 |
| 1270 | Following Orders | 39%(3609/9130) | Jul 17, 2026 |
| 1265 | Area | 38%(3949/10229) | Jul 2, 2026 |
| 1284 | Primitive Roots | 57%(4092/7110) | Jun 26, 2026 |
| 1279 | Art Gallery | 37%(4375/11749) | Jul 16, 2026 |
| 1230 | Pass-Muraille | 31%(4404/13990) | May 27, 2026 |
| 1286 | Necklace of Beads | 38%(4799/12359) | Jul 21, 2026 |
| 1275 | Cashier Employment | 38%(4916/12793) | Jul 14, 2026 |
| 1250 | Tanning Salon | 52%(4973/9464) | Jul 9, 2026 |
| 1247 | Magnificent Meatballs | 64%(5143/8003) | Jul 20, 2026 |
| 1204 | Word Puzzles | 37%(5233/13845) | Jul 19, 2026 |
| 1228 | Grandpa's Estate | 27%(5264/18918) | Jul 21, 2026 |
| 1208 | The Blocks Problem | 40%(5996/14692) | Jul 19, 2026 |
| 1226 | Substrings | 34%(6056/17400) | Jul 19, 2026 |
| 1260 | Pearls | 49%(6761/13606) | Jul 22, 2026 |
| 1200 | Crazy Search | 26%(10669/40200) | Jul 19, 2026 |
| 1269 | Intersecting Lines | 40%(10676/26363) | Jul 21, 2026 |
| 1222 | EXTENDED LIGHTS OUT | 58%(10831/18389) | Jul 16, 2026 |
| 1256 | Anagram | 39%(12304/30858) | Jul 1, 2026 |
| 1236 | Network of Schools | 38%(13170/33848) | Jul 15, 2026 |
| 1274 | The Perfect Stall | 43%(14701/33949) | Jul 21, 2026 |
| 1201 | Intervals | 36%(15767/42649) | Jul 19, 2026 |
| 1298 | The Hardest Problem Ever | 52%(16192/30959) | Jun 24, 2026 |
| 1287 | Networking | 50%(16208/32220) | Jul 22, 2026 |
| 1218 | THE DRUNK JAILER | 59%(19472/32660) | Jul 19, 2026 |
| 1276 | Cash Machine | 37%(20851/56078) | Jul 19, 2026 |
| 1207 | The 3n + 1 problem | 30%(22439/72846) | Jul 19, 2026 |
| 1251 | Jungle Roads | 47%(22470/47727) | Jul 22, 2026 |
| 1258 | Agri-Net | 40%(38216/94306) | Jul 22, 2026 |
| 1273 | Drainage Ditches | 39%(39226/99886) | Jul 19, 2026 |
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