5745265 HI ! My submission from the last contest ( Div.2 382A — Ksenia and Pan Scales). I cannot understand the mistake. Your help is appreciated :) Thankyou .
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Your output is exactly "AC|TL^@^@". You can't really see the last two characters. But, if you output to a file, you will see it. And that is because the last for loop causes an ArrayIndexOutOfBounds in s1 (i goes from zero to two).