Editorial for New Year's '17 P1 - Mr. N and Presents
Remember to use this editorial only when stuck, and not to copy-paste code from it. Please be respectful to the problem author and editorialist.
Submitting an official solution before solving the problem yourself is a bannable offence.
Submitting an official solution before solving the problem yourself is a bannable offence.
The intended solution was to store a pair of <number, query number> in a deque, and to keep track of the latest query number in a map, setting to some default value (e.g. ) upon receiving a remove command. Finally, just loop through the deque and print out the number if the query number is equal to the one stored in the map.
Time Complexity:
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