AtCoder ABCとARCの重複 - メモ@inudaisho

　さてAtCoder のABCの過去問をやろうとしたが、ABを今からやるのは40代のおっさんにとっては時間の無駄でCDを潰していきたい。ということだが、どうもABCの初期は手探り状態だったようでまだレベル感が固まっていないらしい。そこが固まったのがABC042からということでじゃぁそこからやろうかなとおもったが、ARCと重複している。重複してるならARCをやった方がよいのでは？と40代のおっさんらしい事を考えてみたがABC042以降でもABC独自の出題がある。重複してるかしてないかはABC042以降はURLでわかるようになっている。で、ABC042以降についてAtCoder Problemsのデータを抽出して問題の重複を示してみた。赤いのが重複してるところだ。

　結論だけ先に書いておくと、051,054,057,061,064,070,073,075,076,079,080,084,085,088,089,096,099,100,103,104,105,106,109がABC042～ABC109でABC独自の出題となる。

開催	A	B	C	D
ABC109	abc109_a	abc109_b	abc109_c	abc109_d
ABC108	abc108_a	abc108_b	arc102_a	arc102_b
ABC107	abc107_a	abc107_b	arc101_a	arc101_b
ABC106	abc106_a	abc106_b	abc106_c	abc106_d
ABC105	abc105_a	abc105_b	abc105_c	abc105_d
ABC104	abc104_a	abc104_b	abc104_c	abc104_d
ABC103	abc103_a	abc103_b	abc103_c	abc103_d
ABC102	abc102_a	abc102_b	arc100_a	arc100_b
ABC101	abc101_a	abc101_b	arc099_a	arc099_b
ABC100	abc100_a	abc100_b	abc100_c	abc100_d
ABC099	abc099_a	abc099_b	abc099_c	abc099_d
ABC098	abc098_a	abc098_b	arc098_a	arc098_b
ABC097	abc097_a	abc097_b	arc097_a	arc097_b
ABC096	abc096_a	abc096_b	abc096_c	abc096_d
ABC095	abc095_a	abc095_b	arc096_a	arc096_b
ABC094	abc094_a	abc094_b	arc095_a	arc095_b
ABC093	abc093_a	abc093_b	arc094_a	arc094_b
ABC092	abc092_a	abc092_b	arc093_a	arc093_b
ABC091	abc091_a	abc091_b	arc092_a	arc092_b
ABC090	abc090_a	abc090_b	arc091_a	arc091_b
ABC089	abc089_a	abc089_b	abc089_c	abc089_d
ABC088	abc088_a	abc088_b	abc088_c	abc088_d
ABC087	abc087_a	abc087_b	arc090_a	arc090_b
ABC086	abc086_a	abc086_b	arc089_a	arc089_b
ABC085	abc085_a	abc085_b	abc085_c	abc085_d
ABC084	abc084_a	abc084_b	abc084_c	abc084_d
ABC083	abc083_a	abc083_b	arc088_a	arc088_b
ABC082	abc082_a	abc082_b	arc087_a	arc087_b
ABC081	abc081_a	abc081_b	arc086_a	arc086_b
ABC080	abc080_a	abc080_b	abc080_c	abc080_d
ABC079	abc079_a	abc079_b	abc079_c	abc079_d
ABC078	abc078_a	abc078_b	arc085_a	arc085_b
ABC077	abc077_a	abc077_b	arc084_a	arc084_b
ABC076	abc076_a	abc076_b	abc076_c	abc076_d
ABC075	abc075_a	abc075_b	abc075_c	abc075_d
ABC074	abc074_a	abc074_b	arc083_a	arc083_b
ABC073	abc073_a	abc073_b	abc073_c	abc073_d
ABC072	abc072_a	abc072_b	arc082_a	arc082_b
ABC071	abc071_a	abc071_b	arc081_a	arc081_b
ABC070	abc070_a	abc070_b	abc070_c	abc070_d
ABC069	abc069_a	abc069_b	arc080_a	arc080_b
ABC068	abc068_a	abc068_b	arc079_a	arc079_b
ABC067	abc067_a	abc067_b	arc078_a	arc078_b
ABC066	abc066_a	abc066_b	arc077_a	arc077_b
ABC065	abc065_a	abc065_b	arc076_a	arc076_b
ABC064	abc064_a	abc064_b	abc064_c	abc064_d
ABC063	abc063_a	abc063_b	arc075_a	arc075_b
ABC062	abc062_a	abc062_b	arc074_a	arc074_b
ABC061	abc061_a	abc061_b	abc061_c	abc061_d
ABC060	abc060_a	abc060_b	arc073_a	arc073_b
ABC059	abc059_a	abc059_b	arc072_a	arc072_b
ABC058	abc058_a	abc058_b	arc071_a	arc071_b
ABC057	abc057_a	abc057_b	abc057_c	abc057_d
ABC056	abc056_a	abc056_b	arc070_a	arc070_b
ABC055	abc055_a	abc055_b	arc069_a	arc069_b
ABC054	abc054_a	abc054_b	abc054_c	abc054_d
ABC053	abc053_a	abc053_b	arc068_a	arc068_b
ABC052	abc052_a	abc052_b	arc067_a	arc067_b
ABC051	abc051_a	abc051_b	abc051_c	abc051_d
ABC050	abc050_a	abc050_b	arc066_a	arc066_b
ABC049	abc049_a	abc049_b	arc065_a	arc065_b
ABC048	abc048_a	abc048_b	arc064_a	arc064_b
ABC047	abc047_a	abc047_b	arc063_a	arc063_b
ABC046	abc046_a	abc046_b	arc062_a	arc062_b
ABC045	abc045_a	abc045_b	arc061_a	arc061_b
ABC044	abc044_a	abc044_b	arc060_a	arc060_b
ABC043	abc043_a	abc043_b	arc059_a	arc059_b
ABC042	abc042_a	abc042_b	arc058_a	arc058_b