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)
14055 AtCoder PAST202303-OPEN: N. ゴミ出し
14054 AtCoder PAST202303-OPEN: M. お片付け
14053 AtCoder PAST202303-OPEN: L. 順位表
14052 AtCoder PAST202303-OPEN: K. 金貨と袋のゲーム
14051 AtCoder PAST202303-OPEN: J. 図形のシフト
14050 AtCoder PAST202303-OPEN: I. 簡易オマハポーカー
14049 AtCoder PAST202303-OPEN: H. 3 枚階段
14048 AtCoder PAST202303-OPEN: G. 隣り合うマス
14047 AtCoder PAST202303-OPEN: F. 集合の問題
14046 AtCoder PAST202303-OPEN: E. 図形のシャッフル
14045 AtCoder PAST202303-OPEN: D. シューティング
14044 AtCoder PAST202303-OPEN: C. 逆順列
14043 AtCoder PAST202303-OPEN: B. 小数点第 D 位
14042 AtCoder PAST202303-OPEN: A. シンプル石取りゲーム
14041 AtCoder PAST202212-OPEN: O. Shift and Shift
14040 AtCoder PAST202212-OPEN: N. Sequence and Function
14039 AtCoder PAST202212-OPEN: M. Tree and Intervals
14038 AtCoder PAST202212-OPEN: L. Segments
14037 AtCoder PAST202212-OPEN: K. Buy an Integer
14036 AtCoder PAST202212-OPEN: J. Crossing
14035 AtCoder PAST202212-OPEN: I. Order of Height
14034 AtCoder PAST202212-OPEN: H. Digit Diff Sum
14033 AtCoder PAST202212-OPEN: G. Range Sum
14032 AtCoder PAST202212-OPEN: F. Average Ranking
14031 AtCoder PAST202212-OPEN: E. Parentheses
14030 AtCoder PAST202212-OPEN: D. Bozu Mekuri
14029 AtCoder PAST202212-OPEN: C. Triplet Product
14028 AtCoder PAST202212-OPEN: B. Fractional Comparison
14027 AtCoder PAST202212-OPEN: A. Tokens
14026 AtCoder PAST202209-OPEN: O. Pick Two Numbers
14025 AtCoder PAST202209-OPEN: N. From Above and From the Side
14024 AtCoder PAST202209-OPEN: M. series
14023 AtCoder PAST202209-OPEN: L. Exhibition
14022 AtCoder PAST202209-OPEN: K. Checking Connectivity
14021 AtCoder PAST202209-OPEN: J. Sprinkler
14020 AtCoder PAST202209-OPEN: I. Buying Apple Everyday
14019 AtCoder PAST202209-OPEN: H. Three Types of Coins
14018 AtCoder PAST202209-OPEN: G. Wildcards
14017 AtCoder PAST202209-OPEN: F. Pharmacist
14016 AtCoder PAST202209-OPEN: E. Hitting Stick Game
14015 AtCoder PAST202209-OPEN: D. Marking
14014 AtCoder PAST202209-OPEN: C. Biased Dice
14013 AtCoder PAST202209-OPEN: B. Credits
14012 AtCoder PAST202209-OPEN: A. Trafic Light
14011 AtCoder PAST202206-OPEN: O. Area Queries
14010 AtCoder PAST202206-OPEN: N. Building Plan
14009 AtCoder PAST202206-OPEN: M. Reversal
14008 AtCoder PAST202206-OPEN: L. Almost LCS
14007 AtCoder PAST202206-OPEN: K. Subsequence
14006 AtCoder PAST202206-OPEN: J. Holidays
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