- AtCoder に登録したら次にやること ～ これだけ解けば十分闘える！過去問精選 10 問 ～
- レッドコーダーが教える、競プロ・AtCoder上達のガイドライン【中級編：目指せ水色コーダー！】
- アルゴリズム・AtCoder のための数学【前編：数学的知識編①】
2. これが分からないと問題が理解できない！ ～最重要ポイント 12 選～
| color | rank |
|---|---|
| red | S |
| orange | A |
| yellow | B |
| blue | C |
| light blue | D |
| green | E |
| brown | F |
| gray | G |
| No. 221 | type | tried at |
|---|---|---|
| A: Seismic magnitude scales | 2021/10/14 | |
| B: typo | 2022/03/20 | |
| C: Select Mul | 全探索 | 2022/11/02(保留) |
| No. 222 | type | tried at | |
|---|---|---|---|
| A: Four Digits | 標準メソッド | 2022/12/02 | ---------- |
| B: Failing Grade | 算数 | 2022/12/02 | ---------- |
| No. 223 | type | tried at | |
|---|---|---|---|
| A: Exact Price | 標準メソッド | 2022/12/20 | ---------- |
| B: String Shifting | 単純ループ | 2022/12/22 | ---------- |
| No. 224 | type | tried at | |
|---|---|---|---|
| A: Tires | 標準メソッド | 2021/xx/xx | ---------- |
| B: Mongeness | 単純ループ | 2021/xx/xx | ---------- |
| C: Triangle? | permutation | 2021/xx/xx | ---------- |
| No. 225 | rank | type | tried at | |
|---|---|---|---|---|
| A: Distinct Strings | G- | 算数 | 2022/12/30 | ---------- |
| B: Star or Not | G- | 単純ループ | 2022/06/08 | ---------- |
| No. 259 | type | tried at | |
|---|---|---|---|
| A: Growth Record | 算数 | 2022/12/09 | ---------- |
| No. 260 | type | tried at |
|---|---|---|
| A: A Unique Letter | テキスト処理 | 2022/11/07 |
| No. 261 | tried at |
|---|---|
| A: Intersection | 2022/08/21 |
| B: TournamentResult | 2022/08/24 |
| C: NewFolder(1) | 2022/08/28 |
| D: Flipping and Bonus | 2022/08/28 |
| E: Many Operations | 2022/09/03 |
| No. 262 | type | tried at | |
|---|---|---|---|
| A: World Cup | 2022/09/03 | --- | |
| B: Triangle (Easier) | 2022/09/06 | ||
| C: Min Max Pair | 2022/09/05 |
| No. 263 | type | tried at | |
|---|---|---|---|
| A: Full House | 条件マッチ | 2022/10/15 | --- |
| B: Ancestor | 条件マッチ | 2022/10/17 | |
| C: MonotonicallyIncreasing | DFS | 2022/11/09 |
| No. 264 | type | tried at | |
|---|---|---|---|
| A: "atcoder".substr() | 抽出 | 2022/10/18 | --- |
| B: Nice Grid | 条件マッチ | 2022/11/03 |
| No. 265 | type | tried at | |
|---|---|---|---|
| A: Apple | 条件一致 | 2022/10/20 | --- |
| B: Explore | 単純ループ | 2022/11/02 | --- |
| No. 266 | type | tried at | |
|---|---|---|---|
| A: Middle Letter | 抽出 | 2022/10/21 | --- |
| B: Modulo Number | 算数 | 2022/11/15 | --- |
| No. 267 | rank | type | tried at | |
|---|---|---|---|---|
| A: Saturday | G- | 算数 | 2022/11/14 | --- |
| B: Split | G | 全探査 | 2023/01/23 | |
| C: Index × A(Continuous ver.) | F- | DP | 2023/02/01 | |
| D: | E- | 算数 | 2023/01/23 |
| No. 268 | tried at | |
|---|---|---|
| A: Five Integers | 2022/09/10 | --- |
| B: Prefix? | 2022/09/10 | --- |
| C: Chinese Restaurant | 2022/09/10 |
| No. 269 | tried at | |
|---|---|---|
| A: Anyway Takahashi | 2022/09/17 | --- |
| B: Rectangle Detection | 2022/09/17 | --- |
| C: Submask | 2022/09/17 |
| No. 270 | type | tried at | |
|---|---|---|---|
| A: 1-2-4 Test | bit演算 | 2022/09/24 | --- |
| B: Hammer | 場合分け | 2022/09/24 | |
| C: Simple path | DFS |
| No. 271 | type | tried at | |
|---|---|---|---|
| A: 484558 | 16進数 | 2022/10/01 | --- |
| B: Maintain Multiple Sequences | 組み合わせ | 2022/10/01 | --- |
| C: Manga | 最大値 | 2022/10/01 |
- recommended answer
| No. 272 | type | tried at | |
|---|---|---|---|
| A: Integer Sum | 算数 | 2022/10/08 | --- |
| B: Everyone is Friends | 組み合わせ | 2022/10/08 | |
| C: Max Even | 最大値, 場分け | 2022/10/08 |
| No. 273 | type | tried at | |
|---|---|---|---|
| A: A Recursive Function | 算数、再帰 | 2022/10/15 | --- |
| B: Broken Rounding | 組み合わせ | 2022/10/17 |
| No. 274 | type | tried at | |
|---|---|---|---|
| A: Batting Average | 算数 | 2022/10/22 | --- |
| B: Line Sensor | 単純ループ | 2022/10/22 | --- |
| C: Ameba | 単純ループ | 2022/10/25 |
| No. 275 | type | tried at | |
|---|---|---|---|
| A: Find Takahashi | 算数 | 2022/10/31 | --- |
| B: ABC-DEF | 除算 | 2022/11/02 | --- |
| No. 276 | type | tried at | |
|---|---|---|---|
| A: Rightmost | 文字列操作 | 2022/11/05 | --- |
| B: Adjacency List | グラフ | 2022/11/05 | --- |
| C: Previous Permutation | 順列 | 2022/11/06 |
| No. 277 | type | tried at | |
|---|---|---|---|
| A: ^{-1} | 単純ループ | 2022/11/12 | --- |
| B: Playing Cards Validation | 単純ループ | 2022/11/12 | --- |
| C: Ladder Takahashi | DFS/BFS | 2022/11/13 |
| No. 278 | rank | type | tried at | |
|---|---|---|---|---|
| A: Shift | G- | 単純ループ | 2022/11/21 | --- |
| B: Misjudge the Time | G- | 組み合わせ | 2022/11/21 | |
| C: FF | G+ | 単純ループ | 2022/11/21 | |
| D: All Assign Point Add | F- | 工夫 | 2023/01/29 |
| No. 279 | type | tried at | |
|---|---|---|---|
| A: wwwvvvvvv | 算数 | 2022/11/26 | --- |
| B: LOOKUP | 部文字列 | 2022/11/26 | --- |
| C: RANDOM | 単純ループ | 2022/11/26 | --- |
| D: Freefall | 微積分 | 2022/11/29 |
| No. 280 | type | tried at | |
|---|---|---|---|
| A: Pawn on a Grid | 文字列操作 | 2022/12/03 | --- |
| B: Inverse Prefix Sum | 単純ループ | 2022/12/03 | --- |
| C: Extra Character | 単純ループ | 2022/12/03 | --- |
| D: Factorial and Multiple | 2022/12/03(保留) |
| No. 281 | type | tried at | |
|---|---|---|---|
| A: Count Down | 算数 | 2022/12/10 | --- |
| B: Sandwich Number | 標準メソッド | 2022/12/10 | --- |
| C: Circular Playlist | 累積和 | 2022/12/10 | --- |
| D: Max Multiple | DP | 2022/12/10 |
| No. 282 | type | tried at | |
|---|---|---|---|
| A: Generalized ABC | 算数 | 2022/12/17 | --- |
| B: Let's Get a Perfect Score | 単純ループ | 2022/12/17 | --- |
| C: String Delimiter | 累積和 | 2022/12/17 | --- |
| No. 283 | rank | type | tried at | |
|---|---|---|---|---|
| A: Power | G- | 算数 | 2022/12/24 | --- |
| B: First Query Problem | G- | 単純ループ | 2022/12/24 | --- |
| C: Cash Register | G- | 文字列操作 | 2022/12/24 | --- |
| D: Scope | F- | 文字列操作 | 2022/12/25 |
| No. 284 | rank | type | tried at | |
|---|---|---|---|---|
| A: Sequence of Strings | G- | 単純ループ | 2023/01/07 | --- |
| B: Multi Test Cases | G- | 単純ループ | 2023/01/07 | --- |
| C: Count Connected Components | G | DFS/BFS | 2023/01/07 | |
| D: Happy New Year 2023 | F | 整数論 | 2023/01/09 |
| No. 285 | rank | type | tried at | |
|---|---|---|---|---|
| A: Edge Checker 2 | G- | 算数 | 2023/01/15 | --- |
| B: Longest Uncommon Prefix | G- | 単純ループ | 2023/01/15 | |
| C: abc285_brutmhyhiizp | G | 文字列操作 | 2023/01/15 | |
| D: Change Usernames | F+ | DFS/BFS/Union-Find | 2023/01/19 |
| No. 286 | rank | type | tried at | |
|---|---|---|---|---|
| A: Range Swap | G- | 算数 | 2023/01/21 | --- |
| B: Cat | G- | 文字列操作 | 2023/01/21 | --- |
| C: Rotate and Palindrome | F | 文字列操作 | 2023/01/22 | |
| D: Money in Hand | F | DP | 2023/01/22 |
| No. 288 | rank | type | tried at | |
|---|---|---|---|---|
| A: Many A+B Problems | G- | 算数 | 2023/02/04 | ---------- |
| B: Qualification Contest | G- | 単純ループ | 2023/02/04 | ---------- |
| C: Don’t be cycle | F- | DFS/BFS/UnionFind | 2023/02/05 |
| No. 289 | rank | type | tried at | |
|---|---|---|---|---|
| A: flip | G- | 文字列操作 | 2023/02/11 | ---------- |
| B: レ (Chinese Charactor) | G | 単純ループ | 2023/02/11 | |
| C: Coverage | G+ | bit 全探索 | 2023/02/11 |
| No. 290 | rank | type | tried at | |
|---|---|---|---|---|
| A: Contest Result | G- | 算数 | 2023/02/19 | --- |
| B: Qual B | G- | 単純ループ | 2023/02/19 | --- |
| C: Max MEX | G | 単純ループ | 2023/02/19 |
| No. 291 | rank | type | tried at | |
|---|---|---|---|---|
| A: camel Case | G- | 単純ループ | 2023/02/26 | ---------- |
| B: Trimmed Mean | G- | 単純ループ | 2023/02/26 | ---------- |
| C: LRUD Instructions 2 | G | 単純ループ | 2023/02/26 | ---------- |
| D: Flip Cards | F+ | DP | 2023/02/27 |
| No. 292 | rank | type | tried at | |
|---|---|---|---|---|
| A: CAPS LOCK | G- | 文字列操作 | 2023/03/04 | ---------- |
| B: Yellow and Red Card | G- | 単純ループ | 2023/03/04 | ---------- |
| C: Four Variables | F- | 整数論 | 2023/03/08 | |
| D: Unicyclic Components | F | DFS/BFS | 2023/03/04 |
| No. 293 | rank | type | tried at | |
|---|---|---|---|---|
| A: Swap Odd and Even | G- | 文字列操作 | 2023/03/11 | ---------- |
| B: Call the ID Number | G- | 単純ループ | 2023/03/11 | ---------- |
| C: Make Takahashi Happy | F- | bit 全探索/DFS | 2023/03/12 |
| No. 294 | rank | type | tried at | |
|---|---|---|---|---|
| A: Filter | G- | 単純ループ | 2023/03/19 | ---------- |
| B: ASCII Art | G- | 単純ループ | 2023/03/19 | ---------- |
| C: Merge Sequences | G | 単純ループ, 計算量 | 2023/03/19 | ---------- |
| D: Bank | G+ | 単純ループ, 計算量 | 2023/03/19 | |
| E: 2xN Grid | F+ | 2023/03/22 |
| No. 295 | rank | type | tried at | ---------- |
|---|---|---|---|---|
| A: Probably English | G- | 文字列操作 | 2023/05/08 | ---------- |
| B: Bombs | G- | 文字列操作 | 2023/05/18 | |
| C: Socks | G | 単純ループ, 計算量 | 2023/06/06 |
| No. 296 | rank | type | tried at | ---------- |
|---|---|---|---|---|
| A: Alternately | G- | 文字列操作 | 2023/04/01 | ---------- |
| B: Chessboard | G- | 文字列操作 | 2023/04/01 | ---------- |
| C: Gap Existence | G | 単純ループ, 計算量 | 2023/04/01 | ---------- |
| D: M<=ab | F | 整数論 | 2023/04/05 |
| No. 297 | rank | type | tried at | ---------- |
|---|---|---|---|---|
| A: Double Click | G- | 単純ループ | 2023/04/09 | ---------- |
| B: chess960 | G- | 文字列操作 | 2023/04/09 | ---------- |
| C: PC on the Table | G | 単純ループ | 2023/04/09 | ---------- |
| D: Count Subtractions | F- | 単純ループ, 計算量 | 2023/04/09 | ---------- |
| No. 298 | rank | type | tried at | ---------- |
|---|---|---|---|---|
| A: Job Interview | ?? | 単純ループ | 2023/04/15 | ---------- |
| B: Coloring Matrix | ?? | 単純ループ | 2023/04/16 | |
| C: Cards Query Problem | F | 2023/06/01 |
| No. 299 | rank | type | tried at | ---------- |
|---|---|---|---|---|
| A: Treasure Chest | ?? | 文字列操作 | 2023/04/22 | ---------- |
| B: Trick Taking | ?? | 単純ループ | 2023/04/22 | ---------- |
| C: Dango | G- | 単純ループ | 2023/04/22 | ---------- |
| No. 300 | rank | type | tried at | ---------- |
|---|---|---|---|---|
| A: N-choice question | G- | 単純ループ | 2023/04/29 | ---------- |
| B: Same Map in the RPG World | G+ | 全探査 | 2023/05/05 | |
| C: Cross | F- | 単純ループ/工夫 | 2023/05/05 | |
| D: AABBCC | E- | 単純ループ/工夫 | 2023/07/20 |
| No. 301 | rank | type | tried at | ---------- |
|---|---|---|---|---|
| A: Overall Winner | G- | 文字列操 | 2023/05/13 | ---------- |
| B: Fill the Gaps | G- | 単純ループ | 2023/05/13 | ---------- |
| C: AtCoder Cards | G+ | 単純ループ/工夫 | 2023/05/15 | |
| D: Bitmask | E- | 単純ループ/工夫 | 2023/07/17 |
| No. 302 | rank | type | tried at | ---------- |
|---|---|---|---|---|
| A: Attack | G- | 計算/工夫 | 2023/05/20 | |
| B: Find snuke | G+ | 単純ループ/工夫 | 2023/05/21 | |
| C: Almost Equal | F- | 順列 | 2023/05/21 | |
| D: Impartial Gift | F+ | 単純ループ/工夫 | 2023/05/25 |
| No. 303 | rank | type | tried at | ---------- |
|---|---|---|---|---|
| A: Similar String | G- | 単純ループ | 2023/05/27 | ---------- |
| B: Discord | G- | 単純ループ | 2023/05/27 | ---------- |
| C: Dash | F- | 単純ループ | 2023/05/27 | ---------- |
| D: Shift vs. CapsLock | F+ | DP | 2023/05/29 |
| No. 304 | rank | type | tried at | ---------- |
|---|---|---|---|---|
| A: First Player | G | 単純ループ | 2023/06/03 | ---------- |
| B: Subscribers | G | 計算 | 2023/06/03 | ---------- |
| C: Virus | G+ | 単純ループ | 2023/06/03 | ---------- |
| No. 305 | rank | type | tried at | ---------- |
|---|---|---|---|---|
| A: Water Station | G- | 計算 | 2023/06/10 | ---------- |
| B: ABCDEFG | G- | 計算 | 2023/06/10 | ---------- |
| C: Snuke the Cookie Picker | F- | 単純ループ | 2023/06/10 | ---------- |
| D: Sleep Log | 2023/06/13 |
| No. 306 | rank | type | tried at | ---------- |
|---|---|---|---|---|
| A: Echo | G- | ? | 2023/06/17 | ---------- |
| B: Base 2 | G- | 2023/06/17 | ---------- | |
| C: Centers | G | 単純ループ | 2023/07/03 | |
| D: Poisonous Full-Course | F+ | DP | 2023/06/17 |
| No. 307 | rank | type | tried at | ---------- |
|---|---|---|---|---|
| A: Weekly Records | G- | 単純ループ | 2023/06/24 | ---------- |
| B: racecar | G- | 単純ループ | 2023/06/24 | ---------- |
| D: Mismatched Parentheses | F+ | 単純ループ/工夫 | 2023/06/28 |
| No. 308 | rank | type | tried at | ---------- |
|---|---|---|---|---|
| A: New Scheme | G- | 単純ループ | 2023/07/01 | ---------- |
| B: Default Price | G- | 単純ループ | 2023/07/01 | ---------- |
| C: Standings | F | 単純ループ | 2023/07/02 | |
| D: Snuke Maze | F | DFS/BFS | 2023/07/02 |
| No. 309 | rank | type | tried at | ---------- |
|---|---|---|---|---|
| A: Nine | G- | - | 2023/07/08 | ---------- |
| B: Rotate | G- | 単純ループ | 2023/07/08 | ---------- |
| C: Medicine | G+ | 単純ループ/工夫 | 2023/07/12 | |
| D: Add One Edge | F | BFS | 2023/07/08 |
| No. 310 | rank | type | tried at | ---------- |
|---|---|---|---|---|
| A: Order Something Else | G- | 計算 | 2023/07/15 | ---------- |
| B: Strictly Superior | G | 単純ループ | 2023/07/15 | |
| C: Reversible | G+ | 単純ループ | 2023/07/15 | ---------- |
| No. 311 | rank | type | tried at | ---------- |
|---|---|---|---|---|
| A: First ABC | G- | 2023/07/22 | ---------- | |
| B: Vacation Together | G- | 2023/07/22 | ---------- | |
| C: Find it! | F- | 2023/07/22 | ||
| D: Grid Ice Floor | E- | 2023/07/22 |
| No. 312 | rank | type | tried at | ---------- |
|---|---|---|---|---|
| A: Chord | G- | 単純ループ | 2023/07/29 | ---------- |
| B: TaK Code | G | 単純ループ | 2023/08/03 | ---------- |
| C: Invisible Hand | F+ | 2分探査 or 工夫 | 2023/09/18 |
| No. 313 | rank | type | tried at | ---------- |
|---|---|---|---|---|
| A: To Be Saikyo | G- | 単純ループ | 2023/08/05 | ---------- |
| B: Who is Saikyo? | G | DFS | 2023/08/05 | |
| C: Approximate Equalization 2 | F | 単純ループ/工夫 | 2023/08/24 | |
| D: | 2023/08/05 |
| No. 314 | rank | type | tried at | ---------- |
|---|---|---|---|---|
| A: 3.14 | G- | 計算 | 2023/08/12 | ---------- |
| B: Roulette | G | 単純ループ | 2023/08/12 | |
| C: Rotate Colored Subsequence | G+ | 2023/08/13 | ||
| D: LOWER | F | 単純ループ/工夫 | 2023/08/12 |
| No. 315 | rank | type | tried at | ---------- |
|---|---|---|---|---|
| A: tcdr | G- | 文字列操作 | 2023/08/19 | ---------- |
| B: The Middle Day | G- | 単純ループ | 2023/08/19 | ---------- |
| C: Flavors | G+ | 計算/工夫 | 2023/08/19 |
| No. 317 | rank | type | tried at | ---------- |
|---|---|---|---|---|
| A: Potions | G- | 計算 | 2023/08/30 | ---------- |
| B: MissingNo. | G- | 計算 | 2023/08/30 | ---------- |
| C: Remembering the Days | F | 2023/08/26 |
| No. 318 | rank | type | tried at | ---------- |
|---|---|---|---|---|
| A: Full Moon | G- | 計算 | 2023/09/02 | ---------- |
| B: Overlapping sheets | G- | 単純ループ | 2023/09/02 | ---------- |
| C: Blue Spring | F- | 累積和/工夫 | 2023/09/03 |
| No. 319 | rank | type | tried at | ---------- |
|---|---|---|---|---|
| A: Legendary Players | G- | 文字列操作 | 2023/09/12 | ---------- |
| B: Measure | G- | 文字列操作 | 2023/09/12 | ---------- |
| No. 320 | rank | type | tried at | ---------- |
|---|---|---|---|---|
| A: Leyland Number | G- | 計算 | 2023/09/16 | ---------- |
| B: Longest Palindrome | G- | 単純ループ | 2023/09/16 | ---------- |
| No. 321 | rank | type | tried at | ---------- |
|---|---|---|---|---|
| A: 321-like Checker | G- | 単純ループ | 2023/09/23 | ---------- |
| B: Cutoff | G | 全探査 | 2023/09/23 | |
| C: 321-like Searcher | F | bit全探索 | 2023/09/23 |
| No. 322 | rank | type | tried at | ---------- |
|---|---|---|---|---|
| A: First ABC 2 | G- | ? | 2023/09/30 | ---------- |
| B: Prefix and Suffix | G- | 単純ループ | 2023/09/30 | ---------- |
| C: Festival | G- | 単純ループ/工夫 | 2023/09/30 | ---------- |
| No. 323 | rank | type | tried at | ---------- |
|---|---|---|---|---|
| A: Weak Beats | G- | 単純ループ | 2023/10/07 | ---------- |
| B: Round-Robin Tournament | G- | 単純ループ | 2023/10/07 | ---------- |
| C: World Tour Finals | G+ | 単純ループ | 2023/10/07 | ---------- |
| No. 324 | rank | type | tried at | ---------- |
|---|---|---|---|---|
| A: Same | G- | ? | 2023/10/14 | ---------- |
| B: 3-smooth Numbers | G- | 数学 | 2023/10/14 | ---------- |
| C: Error Correction | F | テキスト類似判定 | 2023/10/14 | ---------- |
| D: Square Permutation | E- | 整数判定 | 2023/10/15 |
| No. 325 | rank | type | tried at | ---------- |
|---|---|---|---|---|
| A: Takahashi san | G- | テキスト処理 | 2023/10/21 | ---------- |
| B: World Meeting | G | 範囲内最大値 | 2023/10/21 | |
| C: Sensors | F- | 表走査 | 2023/10/21 | ---------- |
| No. 326 | rank | type | tried at | ---------- |
|---|---|---|---|---|
| A: 2UP3DOWN | G- | ? | 2023/10/28 | ---------- |
| B: 326-like Numbers | G- | 整数判定 | 2023/10/28 | ---------- |
| C: Peak | G+ | 条件内最大値 | 2023/10/28 | ---------- |
| No. 327 | rank | type | tried at | ---------- |
|---|---|---|---|---|
| A: ab | G- | テキスト判定 | 2023/11/04 | ---------- |
| B: A^A | G- | 数学 | 2023/11/04 | ---------- |
| C: Number Place | G | 平面マス | 2023/11/04 | ---------- |
| D: Good Tuple Problem | F+ | DFS | 2023/12/10 |
| No. 328 | rank | type | tried at | ---------- |
|---|---|---|---|---|
| A: Not Too Hard | G- | 計算 | 2023/11/11 | ---------- |
| B: 11/11 | G- | 単純ループ/工夫 | 2023/11/11 | ---------- |
| C: Consecutive | G+ | 累積和 | 2023/11/11 | ---------- |
| D: Take ABC | F | 文字列操作 | 2023/12/10 |
| No. 329 | rank | type | tried at | ---------- |
|---|---|---|---|---|
| A: Spread | G- | 文字列操作 | 2023/11/18 | ---------- |
| B: Next | G- | 条件内最大値 | 2023/11/18 | ---------- |
| C: Count xxx | G | 文字列操作/メモリ | 2023/12/09 | |
| D: Election Quick Report | G+ | 単純ループ/工夫 | 2023/12/09 |
| No. 330 | rank | type | tried at | ---------- |
|---|---|---|---|---|
| A: Counting Passes | G- | 計算 | 2023/11/25 | ---------- |
| B: Minimize Abs 1 | G | 数学 | 2023/11/29 | |
| C: Minimize Abs 2 | F- | 数学 | 2023/11/29 | |
| D: Counting Ls | F | 単純ループ/工夫 | 2023/05/dd |
| No. 331 | rank | type | tried at | ---------- |
|---|---|---|---|---|
| A: Tomorrow | G- | 計算 | 2023/12/02 | ---------- |
| B: Buy One Carton of Milk | G | 全探索 | 2023/12/04 | |
| C: Sum of Numbers Greater Than Me | G+ | 累積和/工夫 | 2023/12/02 | ---------- |
| No. 332 | rank | type | tried at | ---------- |
|---|---|---|---|---|
| A: Online Shopping | G- | 単純ループ | 2023/12/10 | ---------- |
| B: Glass and Mug | G- | 単純ループ | 2023/12/10 | ---------- |
| C: T-shirts | G | 単純ループ | 2023/12/10 | ---------- |
| No. 333 | rank | type | tried at | ---------- |
|---|---|---|---|---|
| A: Three Threes | G- | 単純ループ | 2023/12/16 | ---------- |
| B: Pentagon | G- | 全探索 | 2023/12/16 | ---------- |
| C: Repunit Trio | G+ | 単純ループ/工夫 | 2023/12/23 | |
| D: Erase Leaves | F+ | Union Find/DFS | 2023/12/24 |
| No. 334 | rank | type | tried at | ---------- |
|---|---|---|---|---|
| A: Christmas Present | G- | 計算 | 2023/12/23 | ---------- |
| B: Christmas Trees | F- | 計算 | 2023/12/30 | |
| D: Reindeer and Sleigh | F | 累積和 | 2023/12/23 | ---------- |
| No. 336 | rank | type | tried at | ---------- |
|---|---|---|---|---|
| A: Long Loong | G- | 文字列操作 | 2024/01/14 | ---------- |
| B: CTZ | G- | 計算 | 2024/01/14 | ---------- |
| C: Even Digits | G+ | 工夫 | 2024/02/03 |
| No. 337 | rank | type | tried at | ---------- | ---------- |
|---|---|---|---|---|---|
| A: Scoreboard | G- | 単純ループ | 2024/01/21 | ---------- | ---------- |
| B: Extended ABC | G- | 文字列操作 | 2024/01/21 | ---------- | ---------- |
| C: Lining Up 2 | G+ | 単純ループ | 2024/01/21 | ---------- | ---------- |
| D: Cheating Gomoku Narabe | F+ | 単純ループ/工夫 | 2024/01/22 | 2024/02/03 | |
| E: Bad Juice | E+ | 2進法/工夫 | 2024/01/21 |
| No. 338 | rank | type | tried at | ---------- |
|---|---|---|---|---|
| A: Capitalized? | G- | 文字列操作 | 2024/01/27 | ---------- |
| B: Frequency | G- | 単純ループ | 2024/01/27 | ---------- |
| C: Leftover Recipes | F- | 単純ループ | 2024/01/27 | ---------- |
| No. 339 | rank | type | tried at | ---------- |
|---|---|---|---|---|
| A: TLD | G- | 文字列操作 | 2024/02/03 | ---------- |
| B: Langton's Takahashi | G | 単純ループ | 2024/02/03 | ---------- |
| C: Perfect Bus | G | 単純ループ | 2024/02/03 |
| No. 340 | rank | type | tried at | ---------- |
|---|---|---|---|---|
| A: Arithmetic Progression | G- | 単純ループ | 2024/02/10 | ---------- |
| B: Append | G- | 単純ループ | 2024/02/10 | ---------- |
| No. 341 | rank | type | tried at | ---------- |
|---|---|---|---|---|
| A: Print 341 | G- | 単純ループ | 2024/03/04 | ---------- |
| B: Foreign Exchange | G | 単純ループ | 2024/03/04 | ---------- |
| No. 342 | rank | type | tried at | ---------- |
|---|---|---|---|---|
| A: Yay! | G- | 単純ループ | 2024/02/24 | ---------- |
| B: Which is ahead? | G- | 単純ループ | 2024/02/24 | ---------- |
| C: Many Replacement | F- | 文字列操作/工夫 | 2024/02/24 | |
| D: Square Pair | E | 2024/02/24 |
| No. 343 | rank | type | tried at | ---------- |
|---|---|---|---|---|
| A: Wrong Answer | G- | 計算 | 2024/03/02 | ---------- |
| B: Adjacency Matrix | G- | 単純ループ | 2024/03/02 | ---------- |
| C: 343 | G | 単純ループ | 2024/03/02 | ---------- |
| D: Diversity of Scores | F- | 単純ループ | 2024/03/02 |
| No. 344 | rank | type | tried at | ---------- |
|---|---|---|---|---|
| A: Spoiler | G- | 文字列操作 | 2024/03/09 | ---------- |
| B: Delimiter | G- | 単純ループ | 2024/03/09 | ---------- |
| C: A+B+C | G | 単純ループ | 2024/03/09 | ---------- |
| No. 345 | rank | type | tried at | ---------- |
|---|---|---|---|---|
| A: Leftrightarrow | G- | 文字列操作 | 2024/03/16 | ---------- |
| B: Integer Division Returns | G- | 計算 | 2024/03/16 | ---------- |
| No. 346 | rank | type | tried at | ---------- |
|---|---|---|---|---|
| A: Adjacent Product | G- | 単純ループ | 2024/03/23 | ---------- |
| B: Piano | G+ | 単純ループ | 2024/03/23 | ---------- |
| C: Σ | G | 単純ループ | 2024/03/23 | ---------- |
| No. 347 | rank | type | tried at | ---------- |
|---|---|---|---|---|
| A: Divisible | G- | 単純ループ | 2024/03/30 | ---------- |
| B: Substring | G- | 単純ループ | 2024/03/30 | ---------- |
| No. 348 | rank | type | tried at | ---------- |
|---|---|---|---|---|
| A: Penalty Kick | G- | 単純ループ | 2024/04/06 | |
| B: Farthest Point | G- | 単純ループ | 2024/04/06 | |
| C: Colorful Beans | G | 単純ループ | 2024/04/06 |
| No. 352 | rank | type | tried at | ---------- |
|---|---|---|---|---|
| A: AtCoder Line | G- | 文字列操作 | 2024/05/04 | ---------- |
| B: Typing | G- | 単純ループ | 2024/05/04 | ---------- |
| C: Standing On The Shoulders | G | 単純ループ | 2024/05/04 | ---------- |
| No. 353 | rank | type | tried at | ---------- |
|---|---|---|---|---|
| A: Buildings | G- | 単純ループ | 2024/05/19 | ---------- |
| No. 356 | rank | type | tried at | ---------- |
|---|---|---|---|---|
| A: Subsegment Reverse | G- | 文字列操作 | 2024/06/01 | ---------- |
| B: Nutrients | G- | 単純ループ | 2024/06/01 | ---------- |
| C: Keys | F | 単純ループ | 2024/06/02 |
| No. 357 | rank | type | tried at | ---------- |
|---|---|---|---|---|
| A: Sanitize Hands | G- | 単純ループ | 2024/06/08 | ---------- |
| B: Uppercase and Lowercase | G- | 計算 | 2024/06/08 | ---------- |
| C: Sierpinski carpet | G+ | 単純ループ/MEMO | 2024/06/09 |
| No. 358 | rank | type | tried at | ---------- |
|---|---|---|---|---|
| A: Welcome to AtCoder Land | G- | 文字列操作 | 2024/06/15 | ---------- |
| B: Ticket Counter | G- | 単純ループ | 2024/06/15 | ---------- |
| C: Popcorn | G+ | 単純ループ/bit mask | 2024/06/15 | 2024/06/22 |
| D: Souvenirs | G+ | 単純ループ/工夫 | 2024/06/22 |
| No. 360 | rank | type | tried at | ---------- |
|---|---|---|---|---|
| A: A Healthy Breakfast | G- | 文字列操作 | 2024/06/30 | ---------- |
| B: Vertical Reading | F- | 単純ループ | 2024/06/30 | ---------- |
| C: Move It | G+ | 単純ループ | 2024/06/30 | ---------- |
| No. 362 | rank | type | tried at | ---------- |
|---|---|---|---|---|
| A: Buy a Pen | G- | 計算 | 2024/07/13 | ---------- |
| B: Right Triangle | G- | 数学 | 2024/07/13 | ---------- |
| C: Sum = 0 | F- | 単純ループ/工夫 | 2024/07/13 | 2024/07/28 |
| D: Shortest Path 3 | F+ | Dijkstra | 2024/07/21 |
| No. 364 | rank | type | tried at | ---------- |
|---|---|---|---|---|
| A: Glutton Takahashi | G- | 単純ループ | 2024/07/27 | ---------- |
| B: Grid Walk | G- | 単純ループ | 2024/07/27 | ---------- |
| C: Minimum Glutton | G | 単純ループ | 2024/07/27 | ---------- |
| No. 367 | rank | type | tried at | ---------- |
|---|---|---|---|---|
| A: Shout Everyday | G- | 工夫 | 2024/08/17 | ---------- |
| B: Cut .0 | G- | 文字列操作 | 2024/08/17 | ---------- |
| C: Enumerate Sequences | G | 再帰 | 2024/08/17 | ---------- |
| No. 369 | rank | type | tried at | ---------- |
|---|---|---|---|---|
| A: 369 | G- | 工夫 | 2024/08/31 | ---------- |
| B: Piano 3 | G- | 単純ループ | 2024/08/31 | ---------- |
| C: Count Arithmetic Subarrays | G- | 工夫/単純ループ | 2024/09/08 | |
| D: Bonus EXP | F | DP | 2024/09/21 |
| No. 371 | rank | type | tried at | ---------- |
|---|---|---|---|---|
| A: Jiro | G- | ? | 2024/09/14 | ---------- |
| B: Taro | G- | 単純ループ | 2024/09/14 | ---------- |
| D: 1D Country | F- | 累積和/2分探索 | 2024/09/17 |
| No. 373 | rank | type | tried at | ---------- |
|---|---|---|---|---|
| A: September | G- | 単純ループ | 2024/09/28 | ---------- |
| B: 1D Keyboard | G- | 単純ループ | 2024/09/28 | ---------- |
| C: Max Ai+Bj | G- | 計算 | 2024/09/28 | ---------- |
| D: | F+ | DFS | 2024/09/29 |
| No. 375 | rank | type | tried at | ---------- |
|---|---|---|---|---|
| A: Seats | G- | 単純ループ | 2024/10/12 | ---------- |
| B: Traveling Takahashi Problem | G- | 単純ループ | 2024/10/12 | ---------- |
| D: ABA | F | 工夫 | 2024/10/16 | 2024/10/18 |
| No. 379 | rank | type | tried at | ---------- |
|---|---|---|---|---|
| A: Cyclic | G- | 文字列操作 | 2024/11/09 | ---------- |
| B: Strawberries | G- | 単純ループ | 2024/11/09 | ---------- |
| C: Sowing Stones | E- | 単純ループ | 2024/11/10 | 2024/12/07 |
| D: Home Garden | F+ | 単純ループ | 2024/11/10 |
| No. 381 | rank | type | tried at | ---------- |
|---|---|---|---|---|
| A: 11/22 String | G- | 単純ループ | 2024/11/22 | ---------- |
| B: 1122 String | G | 単純ループ | 2024/11/22 | ---------- |
| C: 11/22 Substring | G+ | 単純ループ | 2024/11/22 | ---------- |
| D: 1122 Substring | E- | 単純ループ/工夫 | 2024/11/26 | 2024/12/01 |
| No. 384 | rank | type | tried at | ---------- |
|---|---|---|---|---|
| A: aaaadaa | G- | 正規表現 | 2024/12/14 | ---------- |
| B: ARC Division | G- | 単純ループ | 2024/12/14 | ---------- |
| C: Perfect Standings | G | bit 全探索 | 2024/12/14 | ---------- |
| No. 387 | rank | type | tried at | ---------- |
|---|---|---|---|---|
| A: Happy New Year 2025 | G- | 計算 | 2025/01/04 | ---------- |
| B: 9x9 Sum | G- | 単純ループ | 2025/01/04 | ---------- |
| D: Snaky Walk | E- | BFS | 2025/01/04 |
| No. 389 | rank | type | tried at | ---------- |
|---|---|---|---|---|
| A: 9x9 | G- | 文字列操作 | 2025/01/18 | ---------- |
| B: tcaF | G- | 単純ループ | 2025/01/18 | ---------- |
| C: Snake Queue | G+ | 累積和 | 2025/01/18 | ---------- |
| No. 394 | rank | type | tried at | ---------- |
|---|---|---|---|---|
| A: 22222 | G- | 文字列操作 | 2025/02/22 | ---------- |
| B: cat | G- | 文字列操作 | 2025/02/22 | ---------- |
| C: Debug | G | 単純ループ | 2025/02/22 | ---------- |
| D: Colorful Bracket Sequence | G+ | 単純ループ | 2025/02/22 | ---------- |
| No. 397 | rank | type | tried at | ---------- |
|---|---|---|---|---|
| A: Thermometer | G- | 文字列操作 | 2025/03/15 | ---------- |
| B: Ticket Gate Log | G | 単純ループ | 2025/03/15 | ---------- |
| C: Variety Split Easy | F- | 単純ループ | 2025/03/15 | ---------- |
| No. 3xx | rank | type | tried at | ---------- |
|---|---|---|---|---|
| A: | 2025/01/dd | |||
| B: | 2025/01/dd | |||
| C: | 2025/01/dd | |||
| D: | 2025/01/dd |
| BeginnersSelection | type | tried at | |||
|---|---|---|---|---|---|
| PracticeA: Welcome to AtCoder | 2021/08/01 | ---------- | ---------- | ||
| ABC086A: Product | 2021/08/01 | ---------- | ---------- | ||
| ABC081A: Placing Marbles | 2021/08/01 | 2022/09/21 | ---------- | ---------- | |
| ABC081B: Shift only | 2021/08/15 | 2022/09/24 | ---------- | ---------- | |
| ABC087B: Coins | 2021/09/06 | 2021/09/25 | 2022/09/24 | ||
| ABC083B: Some Sums | 2021/09/20 | 2022/09/25 | |||
| ABC088B: Card Game for Two | 2021/09/10 | 2022/09/26 | |||
| ABC085B: Kagami Mochi | 最大値 | 2021/08/06 | 2021/08/15 | 2022/09/27 | ---------- |
| ABC085C: Otoshidama | 組み合わせ | 2021/09/20 | 2022/09/27 | ---------- | ---------- |
| ABC049C: Day Dream | パターンマッチ | 2021/08/15 | 2022/10/04 | ||
| ABC086C: Traveling | 2021/09/25 | 2022/10/09 |
| Typical90 | rank | type | tried at | |
|---|---|---|---|---|
| 002: Encyclopedia of Parentheses | ⁎⁎⁎ | bit全探索 | 2023/09/22 | |
| 004: Cross Sum | ⁎⁎ | 累積和 | 2022/11/09 | |
| 007: CP Classes | ⁎⁎⁎ | 2分探査 | 2023/09/22 | ---------- |
| 010: Score Sum Queries | ⁎⁎ | 累積和 | 2022/11/12 | |
| 014: We Used to Sing a Song Together | ⁎⁎⁎ | 単純ループ/工夫？ | 2023/09/26 | ---------- |
| 016: Minimum Coins | ⁎⁎⁎ | 工夫/不変量 | 2023/10/01 | |
| 018: Statue of Chokudai | ⁎⁎⁎ | 幾何学 | 2024/06/26 | |
| 020: Log Inequality | ⁎⁎⁎ | 有効桁数 | 2022/07/23 | ---------- |
| 022: Cubic Cake | ⁎⁎ | GCD | 2022/11/18 | |
| 024: Select +／- One | ⁎⁎ | 単純ループ | 2022/11/18 | ---------- |
| 027: Sign Up Requests | ⁎⁎ | 単純ループ | 2022/11/18 | ---------- |
| 032: AtCoder Ekiden | ⁎⁎⁎ | 有効桁数 | 2024/08/21 | |
| 033: Not Too Bright | ⁎⁎ | 工夫 | 2022/11/24 | ---------- |
| 038: Large LCM | ⁎⁎⁎ | LCM/工夫 | 2024/09/26 | |
| 044: Shift and Swapping | ⁎⁎⁎ | 単純ループ | 2025/02/26 | ---------- |
| 055: Select 5 | ⁎⁎ | 全探索/DP? | 2023/03/25 | |
| 061: Deck | ⁎⁎ | 単純ループ | 2023/03/29 | ---------- |
| 067: Base 8 to 9 | ⁎⁎ | 単純ループ | 2023/09/22 | ---------- |
| 078: Easy Graph Problem | ⁎⁎ | 単純ループ | 2023/09/22 | ---------- |
| TessokuBook | type | tried at | |
|---|---|---|---|
| A61: Adjacent Vertices | graph | 2023/01/01 | |
| A62: Depth First Search | DFS | 2023/01/12 | |
| A63: Shortest Path 1 | BFS | 2023/02/05 | |
| A64: Shortest Path 2 | Dijkstra alg.. | 2023/02/07 | |
| A65: Road to Promotion | DP | 2023/03/15 | |
| A66: Connect Query | Union Find Tre | 2023/09/12 | |
| B61: Influencer | graph | 2023/01/04 | |
| B62: Print a Path | DFS | 2023/01/14 | |
| B63: Breadth First Search | BFS | 2023/02/05 | |
| B64: Shortest Path with Restoration | BFS | 2023/02/05 | |
| B65: Road to Promotion Hard | DFS | 2023/04/25 |
| Educational DP Contest | type | tried at | |
|---|---|---|---|
| P: Independent Set | DP | ---------- |