Vector vs unordered map

#1

why to use unordered map when we have vector available to use??

#2

unordered map and vector are very different
unordered map is a hashing STL

unordered map provides constant time access to value and search time is also constant
while in vector it takes search time of logn (is sorted data ) else liner (in normal case)

In unordered map you strore data by key value pair, and if you want to search a value you do it by a key.
e.g : map[tushar]= 100

In vector you can not do so.

see this link for unordered map
http://www.cplusplus.com/reference/unordered_map/unordered_map/

see this link for map
http://www.cplusplus.com/reference/vector/vector/

#3

hi if you doubt is resolved please it as resolved or please post in the thread.

#4

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