AtCoder記事まとめ

# AtCoder投稿記事まとめリンク集
# 解法イメージ
[ABC381](https://qiita.com/o_chan_t/items/067b1adb4caf0710211b)
[ABC382](https://qiita.com/o_chan_t/items/c65ab38f687f67daed2d)

# アルゴリズム整理
## さ行
[最長増加部分列(動的計画法)](https://qiita.com/o_chan_t/items/696f38fc2e3211352e4e)
[巡回セールスマン(総当たり)](https://qiita.com/o_chan_t/items/87238e109c1c6885cf39)
[巡回セールスマン(動的計画法)](https://qiita.com/o_chan_t/items/87238e109c1c6885cf39)
## な行
[二分探索(上下左右)](https://qiita.com/o_chan_t/items/a9536e163cd8e5200d01)
## ら行
[累積和(2次元)](https://qiita.com/o_chan_t/items/d2c213e50e6a7e5c11a4)
## わ行
[ワーシャルフロイド方法](https://qiita.com/o_chan_t/items/9eb1f29420716cd7a757)


# 解法
## 動的計画法
[ABC011 C (diff:810)](https://qiita.com/o_chan_t/items/09c8b4f3925409d10a0e)
[ABC129 C (diff:796)](https://qiita.com/o_chan_t/items/c47e10e4dcf5caadb88e)
[ABC220 C (diff:664)](https://qiita.com/o_chan_t/items/39c63105d55c9c5cc108)
[ABC248 C (diff:787)](https://qiita.com/o_chan_t/items/d0bad501b3ae8793a4e8)
[ABC261 D (diff:801)](https://qiita.com/o_chan_t/items/684c2d8d940549935319)
[ABC285 E (diff:1466)](https://qiita.com/o_chan_t/items/57a824b80d047b120807)
[ABC303 D (diff:778)](https://qiita.com/o_chan_t/items/0fe3313bbeecf085b8be)
[ABC355 D (diff:735)](https://qiita.com/o_chan_t/items/a19aa704e0ba6798bc9b)
[ABC360 E (diff:1249)](https://qiita.com/o_chan_t/items/51ab12a24778d2f7e80b)
[ABC375 D (diff:1424)](https://qiita.com/o_chan_t/items/befced263f61dd6044d2)
### ビットDP
[ABC142 E (diff:1397)](https://qiita.com/o_chan_t/items/a648ce8f789ebddc7b3a)
[ABC332 E (diff:1883)](https://qiita.com/o_chan_t/items/52218ba22a97c5e548e3)
[巡回セールスマン(動的計画法)](https://qiita.com/o_chan_t/items/87238e109c1c6885cf39)

## BFS
[ABC168 D (diff:804)](https://qiita.com/o_chan_t/items/530e1637c2d2b0739e6e)
[ABC332 D (diff:1175)](https://qiita.com/o_chan_t/items/d913a247bd280359546f)
[ABC361 D の準備 (diff:1202)](https://qiita.com/o_chan_t/items/e2ad6168c0e25c7b0365)
[ABC361 D (diff:1202)](https://qiita.com/o_chan_t/items/328cdf93833379eae656)
[ABC373 D (diff:765)](https://qiita.com/o_chan_t/items/124b7f949006f5329505)
[ABC383 C (diff:750)](https://qiita.com/o_chan_t/items/e9d8310b538abefe4a20)

## DFS
[ABC146 D (diff:1192)](https://qiita.com/o_chan_t/items/da0337a456a57538dfd5)
[ABC184 D (diff:1276)](https://qiita.com/o_chan_t/items/4791c30bcdbdf9cac4ed)

## ダイクストラ法
[ABC340 D (diff:784)](https://qiita.com/o_chan_t/items/cfa96bb73aba4ec79b4a)

## UnionFind
[ABC264 E (diff:1229)](https://qiita.com/o_chan_t/items/ca57a66f4ae28b94676b)
[ABC285 D (diff:663)](https://qiita.com/o_chan_t/items/fc6487f753e6d643a378)
[ABC351 D (diff:974)](https://qiita.com/o_chan_t/items/3790aa26063a0bff16a4)

## 尺取法
[ABC229 D (diff:745)](https://qiita.com/o_chan_t/items/04a8947ee5f1e39c4766)

## 累積和
[ABC337 D (diff:760)](https://qiita.com/o_chan_t/items/e2289469b3aa353a5d2b)

## 二分探索
[ABC146 C (diff:741)](https://qiita.com/o_chan_t/items/dcd701bbf6640110644e)
[ABC195 D (diff:945)](https://qiita.com/o_chan_t/items/13fa4073a9dd10e065f9)
[ABC217 D (diff:802)](https://qiita.com/o_chan_t/items/9a8b2a324bdd00524071)
[ABC248 D (diff:793)](https://qiita.com/o_chan_t/items/fc0ffa8760cf4d11b8cb)
[ABC255 D (diff:788)](https://qiita.com/o_chan_t/items/37cfddbe4baf8c7821ac)
[ABC257 C (diff:678)](https://qiita.com/o_chan_t/items/686653588468f65f7010)
[ABC299 D (diff:684)](https://qiita.com/o_chan_t/items/7443ace174924004d0f6)
[ABC302 D (diff:682)](https://qiita.com/o_chan_t/items/b920791c216dce0b5659)
[ABC304 D (diff:1015)](https://qiita.com/o_chan_t/items/761244157f43b27385dc)
[ABC305 D (diff:671)](https://qiita.com/o_chan_t/items/6b08462e3a98595b8f87)
[ABC321 D (diff:806)](https://qiita.com/o_chan_t/items/e76b89f9dbce3c9c9482)
[ABC360 D (diff:159)](https://qiita.com/o_chan_t/items/f499a1a04e12b3184a45)
[ABC370 D (diff:1088)](https://qiita.com/o_chan_t/items/ea691572f69acf0bedb5)
[ABC375 D (diff:658)](https://qiita.com/o_chan_t/items/3b7883c7052cc6c2cf78)
[ABC374 D (diff:1504)](https://qiita.com/o_chan_t/items/b4f983d89c2cfd445cdd)

## ビット全探索
[ABC128 C (diff:805)](https://qiita.com/o_chan_t/items/2777476103e563fe4d9a)
[ABC197 C (diff:809)](https://zenn.dev/o_chan/articles/c982805e196c82)


## 素因数分解
[ABC142 D (diff:842)](https://qiita.com/o_chan_t/items/3f3ff6c8e0a74452775b)
[ABC254 D (diff:1191)](https://qiita.com/o_chan_t/items/3fead600390d1c07ba81)

## 幾何学
[ABC197 D (diff:831)](https://qiita.com/o_chan_t/items/b4bdfdc60808e56e76e3)

## ビット演算
[ABC261 E (diff:1261)](https://zenn.dev/o_chan/articles/5e4a02e1109ca7)

### 排他的論理和
[ABC295 D (diff:939)](https://qiita.com/o_chan_t/items/0b0a923d50f5fcad095f)

## その他
### ピラミッド数列
[ABC336 D (diff:991)](https://qiita.com/o_chan_t/items/4e067a9f1ba21a0d77ed)

### グリッド走査
[ABC241 C (diff:664)](https://qiita.com/o_chan_t/items/ec6f4991dc46d61a15eb)

### モジュロ演算
[ABC146 E (diff:1762)](https://qiita.com/o_chan_t/items/8e0b8ce3216b4704720a)

### スタック
[ABC307 D (diff:666)](https://qiita.com/o_chan_t/items/ebd4523ca152eb2a65e6)

### ヒープキュー
[ABC141 D (diff:823)](https://qiita.com/o_chan_t/items/ab7941c1e2712c4daa60)

### 境界問題
[ABC180 D (diff:752)](https://zenn.dev/o_chan/articles/5e4a02e1109ca7)

### 未カテゴリ
[ABC006 B (diff:813)](https://qiita.com/o_chan_t/items/0cbf5adbb8763b9625d7)
[ABC035 B (diff:804)](https://qiita.com/o_chan_t/items/d38b6fedf0e74a3d80b6)
[ABC051 B (diff:784)](https://qiita.com/o_chan_t/items/a233c1387fdd5387bd0e)
[ABC061 C (diff:808)](https://qiita.com/o_chan_t/items/69949bbb927bdf16cbc6)
[ABC197 C (diff:809)](https://qiita.com/o_chan_t/items/a23f3b3e60caf373b7d9)
[ABC245 D (diff:815)](https://qiita.com/o_chan_t/items/9db32af84266bff7dc9b)

# AtCoder開催順
[ABC006 B (diff:813)](https://qiita.com/o_chan_t/items/0cbf5adbb8763b9625d7)
[ABC011 C (diff:810)](https://qiita.com/o_chan_t/items/09c8b4f3925409d10a0e)
[ABC035 B (diff:804)](https://qiita.com/o_chan_t/items/d38b6fedf0e74a3d80b6)
[ABC051 B (diff:784)](https://qiita.com/o_chan_t/items/a233c1387fdd5387bd0e)
[ABC061 C (diff:808)](https://qiita.com/o_chan_t/items/69949bbb927bdf16cbc6)
[ABC128 C (diff:805)](https://qiita.com/o_chan_t/items/2777476103e563fe4d9a)
[ABC129 C (diff:796)](https://qiita.com/o_chan_t/items/c47e10e4dcf5caadb88e)
[ABC141 D (diff:823)](https://qiita.com/o_chan_t/items/ab7941c1e2712c4daa60)
[ABC142 D (diff:842)](https://qiita.com/o_chan_t/items/3f3ff6c8e0a74452775b), [ABC142 E (diff:1397)](https://qiita.com/o_chan_t/items/a648ce8f789ebddc7b3a)
[ABC146 C (diff:741)](https://qiita.com/o_chan_t/items/dcd701bbf6640110644e), [ABC146 D (diff:1192)](https://qiita.com/o_chan_t/items/da0337a456a57538dfd5), [ABC146 E (diff:1762)](https://qiita.com/o_chan_t/items/8e0b8ce3216b4704720a)
[ABC148 E (diff:818)](https://qiita.com/o_chan_t/items/65847a01260629bf0a54)
[ABC168 D (diff:804)](https://qiita.com/o_chan_t/items/530e1637c2d2b0739e6e)
[ABC180 D (diff:752)](https://zenn.dev/o_chan/articles/5e4a02e1109ca7)
[ABC184 D (diff:1276)](https://qiita.com/o_chan_t/items/4791c30bcdbdf9cac4ed)
[ABC195 D (diff:945)](https://qiita.com/o_chan_t/items/13fa4073a9dd10e065f9)
[ABC197 B (diff:96)](https://qiita.com/o_chan_t/items/1d9c04e3d12e5c913408), [ABC197 C (diff:809)](https://zenn.dev/o_chan/articles/c982805e196c82), [ABC197 D (diff:831)](https://qiita.com/o_chan_t/items/b4bdfdc60808e56e76e3)
[ABC217 D (diff:802)](https://qiita.com/o_chan_t/items/9a8b2a324bdd00524071)
[ABC220 C (diff:664)](https://qiita.com/o_chan_t/items/39c63105d55c9c5cc108)
[ABC229 D (diff:745)](https://qiita.com/o_chan_t/items/04a8947ee5f1e39c4766)
[ABC241 C (diff:664)](https://qiita.com/o_chan_t/items/ec6f4991dc46d61a15eb)
[ABC245 D (diff:815)](https://qiita.com/o_chan_t/items/9db32af84266bff7dc9b)
[ABC248 C (diff:787)](https://qiita.com/o_chan_t/items/d0bad501b3ae8793a4e8), [ABC248 D (diff:793)](https://qiita.com/o_chan_t/items/fc0ffa8760cf4d11b8cb)
[ABC250 D (diff:797)](https://qiita.com/o_chan_t/items/ebdbbfd41bc4a0bc1599)
[ABC254 D (diff:1191)](https://qiita.com/o_chan_t/items/3fead600390d1c07ba81)
[ABC255 D (diff:788)](https://qiita.com/o_chan_t/items/37cfddbe4baf8c7821ac)
[ABC257 C (diff:678)](https://qiita.com/o_chan_t/items/686653588468f65f7010)
[ABC261 D (diff:801)](https://qiita.com/o_chan_t/items/684c2d8d940549935319), [ABC261 E (diff:1261)](https://qiita.com/o_chan_t/items/8003801eea149d854dd7)
[ABC264 C (diff:758)](https://qiita.com/o_chan_t/items/13086778f73b59fc0cf6), [ABC264 D (diff:414)](https://qiita.com/o_chan_t/items/e0972f268f51c2756cb7), [ABC264 E (diff:1229)](https://qiita.com/o_chan_t/items/ca57a66f4ae28b94676b)
[ABC275 C (diff:760)](https://qiita.com/o_chan_t/items/574a80a85fd7fa0f6c58)
[ABC285 D (diff:663)](https://qiita.com/o_chan_t/items/fc6487f753e6d643a378), [ABC285 E (diff:1466)](https://qiita.com/o_chan_t/items/57a824b80d047b120807)
[ABC287 D (diff:786)](https://qiita.com/o_chan_t/items/beb8184774ca70dd22fd)
[ABC292 E (diff:792)](https://zenn.dev/o_chan/articles/a32e31fd5bf5cb)
[ABC295 D (diff:939)](https://qiita.com/o_chan_t/items/0b0a923d50f5fcad095f)
[ABC299 D (diff:684)](https://qiita.com/o_chan_t/items/7443ace174924004d0f6)
[ABC302 D (diff:682)](https://qiita.com/o_chan_t/items/b920791c216dce0b5659)
[ABC303 D (diff:778)](https://qiita.com/o_chan_t/items/0fe3313bbeecf085b8be)
[ABC304 D (diff:1015)](https://qiita.com/o_chan_t/items/761244157f43b27385dc)
[ABC305 D (diff:671)](https://qiita.com/o_chan_t/items/6b08462e3a98595b8f87)
[ABC307 D (diff:666)](https://qiita.com/o_chan_t/items/ebd4523ca152eb2a65e6)
[ABC313 C (diff:681)](https://qiita.com/o_chan_t/items/934977d066f3a28698bc)
[ABC321 D (diff:806)](https://qiita.com/o_chan_t/items/e76b89f9dbce3c9c9482)
[ABC332 D (diff:1175)](https://qiita.com/o_chan_t/items/d913a247bd280359546f), [ABC332 E (diff:1883)](https://qiita.com/o_chan_t/items/52218ba22a97c5e548e3)
[ABC336 D (diff:991)](https://qiita.com/o_chan_t/items/4e067a9f1ba21a0d77ed)
[ABC337 D (diff:760)](https://qiita.com/o_chan_t/items/e2289469b3aa353a5d2b)
[ABC340 D (diff:784)](https://qiita.com/o_chan_t/items/cfa96bb73aba4ec79b4a)
[ABC351 D (diff:974)](https://qiita.com/o_chan_t/items/3790aa26063a0bff16a4)
[ABC355 D (diff:735)](https://qiita.com/o_chan_t/items/a19aa704e0ba6798bc9b)
[ABC359 C (diff:828)](https://qiita.com/o_chan_t/items/f74b0be7b6c36d3af626)
[ABC360 C (diff:36)](https://qiita.com/o_chan_t/items/ad5120fc211a6fd875f4), [ABC360 D (diff:159)](https://qiita.com/o_chan_t/items/f499a1a04e12b3184a45), [ABC360 E (diff:1249)](https://qiita.com/o_chan_t/items/51ab12a24778d2f7e80b)
[ABC361 D (diff:1202)](https://qiita.com/o_chan_t/items/328cdf93833379eae656)
[ABC362 C (diff:521)](https://qiita.com/o_chan_t/items/e518ecd62ad00afb4633)
[ABC368 D (diff:816)](https://qiita.com/o_chan_t/items/5839b0524e57c6c615d1), [ABC368 E (diff:2140)](https://qiita.com/o_chan_t/items/ee33be4b6af746199283)
[ABC369 D (diff:621)](https://qiita.com/o_chan_t/items/5b59c26d10788fa551a3), [ABC369 E (diff:1301)](https://qiita.com/o_chan_t/items/0caec9c032b49bed89b0)
[ABC370 C (diff:228)](https://qiita.com/o_chan_t/items/5de62ba847a0e3504b5a), [ABC370 D (diff:1088)](https://qiita.com/o_chan_t/items/ea691572f69acf0bedb5)
[ABC371 C (diff:849)](https://qiita.com/o_chan_t/items/81a46d96112bc3c2300b), [ABC371 D (diff:408)](https://qiita.com/o_chan_t/items/f9ed4a01a3125500acab), [ABC371 E (diff:981)](https://qiita.com/o_chan_t/items/3e9998fcf348bb9f13da)
[ABC372 C (diff:341)](https://qiita.com/o_chan_t/items/7ae566ee0a510d234a80), [ABC372 D (diff:901)](https://qiita.com/o_chan_t/items/8013b43a5881420d8048), [ABC372 E (diff:1042)](https://qiita.com/o_chan_t/items/ede9ff0c9fe4b76d2396)
[ABC373 C (diff:75)](https://qiita.com/o_chan_t/items/e09143408dc986e34877), [ABC373 D (diff:765)](https://qiita.com/o_chan_t/items/124b7f949006f5329505), [ABC373 E (diff:1592)](https://qiita.com/o_chan_t/items/70d081922c6a7d8e5681)
[ABC374 C (diff:226)](https://qiita.com/o_chan_t/items/6a19fbcf5de588ebc8e1), [ABC374 D (diff:694)](https://qiita.com/o_chan_t/items/c34c731ce3afd2708eb7), [ABC374 E (diff:1504)](https://qiita.com/o_chan_t/items/b4f983d89c2cfd445cdd)
[ABC375 C (diff:972)](https://qiita.com/o_chan_t/items/1ab563cf7c348dec994c), [ABC375 D (diff:658)](https://qiita.com/o_chan_t/items/3b7883c7052cc6c2cf78), [ABC375 E (diff:1424)](https://qiita.com/o_chan_t/items/befced263f61dd6044d2)
[ABC378 E (diff:1406)](https://qiita.com/o_chan_t/items/b1954cb730a5c07e9aed)
[ABC379 C (diff:951)](https://qiita.com/o_chan_t/items/e4bc57fde329a1a85b80)
[ABC383 C (diff:750)](https://qiita.com/o_chan_t/items/e9d8310b538abefe4a20)

# 証明作業
## 数学的帰納法
[ABC011 C (diff:810)](https://qiita.com/o_chan_t/items/09c8b4f3925409d10a0e#%E6%95%B0%E5%AD%A6%E7%9A%84%E5%B8%B0%E7%B4%8D%E6%B3%95%E3%81%AB%E3%82%88%E3%82%8B%E8%A8%BC%E6%98%8E)
[ABC261 D (diff:801)](https://qiita.com/o_chan_t/items/684c2d8d940549935319#%E6%95%B0%E5%AD%A6%E7%9A%84%E5%B8%B0%E7%B4%8D%E6%B3%95%E3%81%AB%E3%82%88%E3%82%8B%E8%A8%BC%E6%98%8E)
[ABC285 E (diff:1466)](https://qiita.com/o_chan_t/items/57a824b80d047b120807#%E6%95%B0%E5%AD%A6%E7%9A%84%E5%B8%B0%E7%B4%8D%E6%B3%95%E3%81%AB%E3%82%88%E3%82%8B%E8%A8%BC%E6%98%8E)

# エッセンス
## BFS
[ABC383 C (diff:750)](https://qiita.com/o_chan_t/items/e9d8310b538abefe4a20#bfs%E7%AE%87%E6%89%80%E3%81%AE%E3%81%BF%E6%8A%BD%E5%87%BA)

## 動的計画法
[ABC011 C (diff:810)](https://qiita.com/o_chan_t/items/09c8b4f3925409d10a0e#%E5%8B%95%E7%9A%84%E8%A8%88%E7%94%BB%E6%B3%95%E3%81%AB%E3%82%88%E3%82%8B%E6%9C%80%E5%B0%8F%E3%82%B9%E3%83%86%E3%83%83%E3%83%97%E6%95%B0%E8%A8%88%E7%AE%97%E9%96%A2%E6%95%B0)

## 動的計画法(文章説明)
[ABC248 C (diff:787)](https://qiita.com/o_chan_t/items/d0bad501b3ae8793a4e8#%E5%8B%95%E7%9A%84%E8%A8%88%E7%94%BB%E6%B3%95%E3%81%AE%E8%A3%9C%E8%B6%B3)

## 二分探索
[ABC217 D (diff:802)](https://qiita.com/o_chan_t/items/9a8b2a324bdd00524071)

# pythonモジュール
- from itertools import product

- from sortedcontainers import SortedList
[ABC141 D (diff:823)](https://qiita.com/o_chan_t/items/ab7941c1e2712c4daa60#ac%E3%82%B3%E3%83%BC%E3%83%892)
[ABC217 D (diff:802)](https://qiita.com/o_chan_t/items/9a8b2a324bdd00524071)
[ABC355 D (diff:735)](https://qiita.com/o_chan_t/items/a19aa704e0ba6798bc9b)
[ABC370 D (diff:1088)](https://qiita.com/o_chan_t/items/ea691572f69acf0bedb5)

# 競技プログラミングを解いているときの感情
1. 30分以上かけてAC出来なければ諦めると決めていても、解けそうな感じがすると時間を忘れて解きにかかってしまう。
1. 苦労して解いた問題のdiffを見て、予想より低かったらACしてもガッカリする。
1. D問題を5問連続して解けたら、D問題レベル楽じゃね？って感じるものの、難問C問題に遭遇して勘違いだと思い知る。
1. 動的計画法の問題は解けても復元出来ないことがよくある。
1. 開発作業で、コードの中にDFS/BFS/UnionFind/DPを使うチャンスがないか考えてしまう。
1. ある程度慣れくると、diff:1000未満の問題は意地でも解いてやろうという気になって時間を忘れる。
1. TLEくらいまくって苦戦してた問題に対して、サクサクACが進むと脳汁が出る。
1. 初期は動的計画法に対し苦手意識を感じるが、慣れてくると(解ける解けないは別とし)楽しくなってくる。
1. D問題に慣れてきた時に、茶色コーダーの壁が妙に高いことに驚く。
1. C問題の中に難問が紛れ込んでいて、A→B→C→D→Eの順番で解かない方が良いと気づく。
1. diff75の問題がC問題にまぎれていると、本当に正しいのか不安になる。([AtCoder373 C問題](https://qiita.com/o_chan_t/items/e09143408dc986e34877))
1. 解き方にめちゃくちゃ苦労したのに驚くほどdiff値(36)が低くてショックを受ける。[ABC360 C (diff:36)](https://qiita.com/o_chan_t/items/ad5120fc211a6fd875f4)この問題がdiff36とかウッソだろ⋯？[ABC360 D (diff:159)](https://qiita.com/o_chan_t/items/f499a1a04e12b3184a45)もdiff159の灰色問題って、言うほど簡単問題か？
1. 慣れ始めてくると、解けた喜びから、解けない(理解できない)苦しみに変わりスランプに陥る。スランプに陥ると競プロをサクサク解ける人間との差に絶望し、自己嫌悪する。
1. AtCoder300回以降って、難易度がそれ以前と比べて、高くなってない？AtCoder挑戦者のレベルが上ってるから？と感じる。

# バックアップ(別解)
[ABC217 D (diff:802)](https://qiita.com/o_chan_t/items/984c192a1df4074c13f7)

# 復習
[ABC011 C (diff:810)](https://zenn.dev/o_chan/articles/ecdbdaf0cf2425)
[ABC272 D (diff:804)](https://zenn.dev/o_chan/articles/7014d86553e585)

# 解の種
## グラフ
### DFS
[ABC361 E (diff:1213)/木の直径計算](https://qiita.com/o_chan_t/items/4edc1037c9ca2283ff9f)

## 動的計画法
[ABC362 E (diff:1225)/数列内の等差部分列の総数を動的計画法でカウント](https://qiita.com/o_chan_t/items/a1e7414e56feaf2117b7#%E6%95%B0%E5%88%97%E5%86%85%E3%81%AE%E7%AD%89%E5%B7%AE%E9%83%A8%E5%88%86%E5%88%97%E3%81%AE%E7%B7%8F%E6%95%B0%E3%82%92%E5%8B%95%E7%9A%84%E8%A8%88%E7%94%BB%E6%B3%95%E3%81%A7%E3%82%AB%E3%82%A6%E3%83%B3%E3%83%88)
[ABC362 E (diff:1225)/数列内の等差部分列の総数(ざっくりイメージ)](https://qiita.com/o_chan_t/items/cb673ce7829ca5fa753d)

## 数学
### 逆数
[ABC362 E (diff:1225)/階乗と逆元の前計算](https://qiita.com/o_chan_t/items/a1e7414e56feaf2117b7#%E9%9A%8E%E4%B9%97%E3%81%A8%E9%80%86%E5%85%83%E3%81%AE%E5%89%8D%E8%A8%88%E7%AE%97)

### 組み合わせ
[ABC362 E (diff:1225)/要素の出現頻度に基づく組み合わせ数の計算](https://qiita.com/o_chan_t/items/a1e7414e56feaf2117b7#%E8%A6%81%E7%B4%A0%E3%81%AE%E5%87%BA%E7%8F%BE%E9%A0%BB%E5%BA%A6%E3%81%AB%E5%9F%BA%E3%81%A5%E3%81%8F%E7%B5%84%E3%81%BF%E5%90%88%E3%82%8F%E3%81%9B%E6%95%B0%E3%81%AE%E8%A8%88%E7%AE%97)

### 等差数列部分列判定問題
[ABC362 E (diff:1225)/等差数列部分列判定問題](https://qiita.com/o_chan_t/items/a1e7414e56feaf2117b7#%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%E9%83%A8%E5%88%86%E5%88%97%E5%88%A4%E5%AE%9A%E5%95%8F%E9%A1%8C)

# 失敗事例
[ABC003 B (diff:668)](https://qiita.com/o_chan_t/items/afef145deafc17e73a55)
[ABC315 D (diff:1531)](https://qiita.com/o_chan_t/items/4aca053714a4c9773049)
[ABC332 E (diff:1883)](https://qiita.com/o_chan_t/items/2cd55a2fc6b848d9a617)


# その他(個人用覚書ページ)
[【覚書】pythonコピペ関数(001)](https://qiita.com/o_chan_t/items/4e2489874f7b7a2f1698)
[Perplexity AIとInstructorを利用した構造化出力サンプルプログラム](https://qiita.com/o_chan_t/items/25c5bf2e43432691b411)