Starlight

Over 20,000 problems available: AMC 8/10/12 and AIME problems from 2010-2024; USAJMO/USAMO problems from 2002-2024; USACO problems from 2014 to 2024 (all divisions); all Codeforces, AtCoder and DMOJ problems. If you leave the search field blank, it returns all problems with the specified type.

Reset

Need help searching? Click for format/examples of problems
  • AMC 8: [year] AMC 8 Problem #, Ex: 2013 AMC 8 Problem 1
  • AMC 10: [year] AMC 10A Problem # OR [year] AMC 10B Problem #, Ex: 2015 AMC 10A Problem 16
  • AMC 12: [year] AMC 12A Problem # OR [year] AMC 12B Problem #, Ex: 2021 AMC 12B Problem 25
  • AIME: [year] AIME I Problem # OR [year] AIME II Problem #, Ex: 2013 AIME I Problem 8
  • USAJMO/USAMO: [year] USAJMO/USAMO Problem #, Ex: 2023 USAJMO Problem 1
  • Codeforces: Codeforces [contest id (e.g. 101)][problem id (e.g. A, B, C)]: [Codeforces problem name], Ex: Codeforces 1336F: Journey
  • AtCoder: AtCoder [contest id (e.g. ABC314, ARC164, ZONE2021)]: [problem id (A, B, C)]. [Problem name], Ex: AtCoder ZONE2021: E. Sneaking
  • DMOJ: DMOJ [contest name (if applicable)] [problem number (e.g. P1)] - [Problem name], Ex: DMOJ Yet Another Contest 3 P1 - Shell Swap Scam
  • USACO: [year] [contest month (e.g. January, US Open)], [division (e.g. Gold)]: [Problem name], Ex: USACO 2023 US Open Contest, Bronze: Rotate and Shift

ID Problem Name (click to add insights/hints, view summary of insights/hints and similar problems)
17505 DMOJ ECOO '07 R3 P4 - Reverse Polish Logic
17504 DMOJ ECOO '07 R3 P1 - Sum of Primes
17503 DMOJ ICPC ECNA 2019 C - Cheese, If You Please
17502 DMOJ ICPC ECNA 2016 J - Yes, Yes, It's Nonograms
17501 DMOJ ICPC ECNA 2016 I - Waif Until Dark
17500 DMOJ ICPC ECNA 2016 H - Vin Diagrams
17499 DMOJ ICPC ECNA 2016 G - That's One Hanoi-ed Teacher
17498 DMOJ ICPC ECNA 2016 F - Removal Game
17497 DMOJ ICPC ECNA 2016 E - Red Rover
17496 DMOJ ICPC ECNA 2016 D - Lost in Translation
17495 DMOJ ICPC ECNA 2016 C - The Key to Cryptography
17494 DMOJ ICPC ECNA 2016 B - Foosball Dynasty
17493 DMOJ ICPC ECNA 2016 A - Bubbly Troubly
17492 DMOJ ICPC ECNA 2005 H - Two Ends
17491 DMOJ ICPC ECNA 2005 G - Swamp Things
17490 DMOJ ICPC ECNA 2005 F - Square Count
17489 DMOJ ICPC ECNA 2005 E - Reliable Nets
17488 DMOJ ICPC ECNA 2005 D - Queens, Knights and Pawns
17487 DMOJ ICPC ECNA 2005 C - The Game of Efil
17486 DMOJ ICPC ECNA 2005 B - Countdown
17485 DMOJ ICPC ECNA 2005 A - ACM (ACronym Maker)
17484 DMOJ ICPC ECNA 2000 F - To Bet or Not To Bet
17483 DMOJ ICPC ECNA 2000 E - Checker's Check
17482 DMOJ ICPC ECNA 2000 D - Stacking Cubes
17481 DMOJ ICPC ECNA 2000 C - Rational Approximation
17480 DMOJ ICPC ECNA 2000 B - Poly-polygonal Numbers
17479 DMOJ ICPC ECNA 2000 A - Picnic Planning
17478 DMOJ Dynamic Sum
17477 DMOJ DWITE '12 R5 #5 - Pattern Lock
17476 DMOJ DWITE '12 R5 #4 - Fencing Problems
17475 DMOJ DWITE '12 R5 #3 - Triangle Count
17474 DMOJ DWITE '12 R5 #2 - Copycat SMS
17473 DMOJ DWITE '12 R5 #1 - Travel Time
17472 DMOJ DWITE '12 R2 #5 - Car Hoppers
17471 DMOJ DWITE '12 R2 #4 - Magic Trick
17470 DMOJ DWITE '12 R2 #3 - Bitstrings
17469 DMOJ DWITE '12 R2 #2 - Word Arithmetic
17468 DMOJ DWITE '12 R2 #1 - Sugar Rush
17467 DMOJ DWITE '12 R1 #5 - Haunted House
17466 DMOJ DWITE '12 R1 #4 - Trick or Tree'ing
17465 DMOJ DWITE '12 R1 #3 - Costume Party
17464 DMOJ DWITE '12 R1 #2 - Candybar Graphs
17463 DMOJ DWITE '12 R1 #1 - Candy Piles
17462 DMOJ DWITE '11 R5 #5 - Binary Weight
17461 DMOJ DWITE '11 R5 #4 - Cube World
17460 DMOJ DWITE '11 R5 #3 - Unit rectangles
17459 DMOJ DWITE '11 R5 #2 - Forest Fires
17458 DMOJ DWITE '11 R5 #1 - Age Gate
17457 DMOJ DWITE '11 R4 #5 - Comet Vomit
17456 DMOJ DWITE '11 R4 #4 - Lego Ladder
View links to all pages 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514

About • Privacy Notice • Rules • Problems list • Journal • Your profile • GitHub

Moon Symbol icon by Icons8 • Sun icon by Icons8 • Emojis from Twemoji by Twitter under CC by 4.0