java - Cost of merging two hashmaps -


let's have 2 hashmaps follow

hashmap<character, integer> map1 = new hashmap<character, integer>(); hashmap<character, integer> map2 = new hashmap<character, integer>();

now want merge these 2 , put them hashmap map3

what best way in terms of asymptotic complexity.

in terms of asymptotic complexity means creating new map , adding elements of each map it. t(insertion) * (m + n) (i won't reveal answer in case homework!). java hash map no more efficient text book hash map, there no shortcuts there. finally, if can arbitrarily modify either 1 of 2 maps, recommend merging smaller larger. save time spent iterating through large map , might save time spent in memory allocation.


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