Hello! I was solving last year's JBOI but I couldn't solve the second problem — palm trees. Can one tell me how to solve it? Thanks
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Worst problem ever ;) Ask ZenekMartyniuk, only he managed to AC it during the competition. Use some segtrees and many special cases. But, seriously, there are more valuable problems tham this shit...
Do we have an alternating sequence craze here now? :P