No.672 Longest AB Sequence
レベル :
/ AI推定難易度 : 700
/ 実行時間制限 : 1ケース 2.000秒 / メモリ制限
: 512 MB / 標準ジャッジ問題
タグ : / 解いたユーザー数 295
作問者 :
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/ テスター :
はむこ
タグ : / 解いたユーザー数 295
作問者 :
nmnmnmnmnmnmnm
/ テスター :
はむこ
問題文最終更新日: 2026-06-26 06:07:25
English (AI translation)
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yukicoder contest 188
(順位表)
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Problem Statement
There is a string $S$ consisting of the characters 'A' and 'B'.
Find the maximum length of a contiguous section of $S$ in which the number of 'A's and the number of 'B's are equal.
Input
$S$
The string $S$ consists of the characters 'A' and 'B'. $1 \le S$'s length$ \le 200000$.
Output
Output the length that is the answer on one line.
If there is no string that qualifies as the answer, output a length of 0.
Print a newline at the end.
Sample
Sample 1
Input
AAABBA
Output
4
The longest ones are "AABB" and "ABBA".
Their length is 4.
Sample 2
Input
ABBBBBA
Output
2
The longest ones are "AB" and "BA".
Their length is 2.
Sample 3
Input
B
Output
0
If there is no answer, treat the length as 0.
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