Editorial for WC '17 Contest 4 J2 - Anger Management - Olympiads Online Judge

Editorial for WC '17 Contest 4 J2 - Anger Management

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We can iterate over the sequence of $N$ ~N~ events while maintaining two pieces of information – Bruce Banner's current anger level $a$ ~a~, and the number of times $h$ ~h~ that he's transformed into the Hulk so far (both of which are initially $0$ ~0~). Upon inputting each $A_i$ ~A_i~, we should check if both $a < 10$ ~a < 10~ and $a+A_i \ge 10$ ~a+A_i \ge 10~ – if so, it's time to increment $h$ ~h~ by $1$ ~1~. Either way, we should then increment $a$ ~a~ by $A_i$ ~A_i~. At the end, we can output the final value of $h$ ~h~.

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