how to remove duplicated elements from a vector without allocating space for another vector code example

Example 1: erase duplicates and sort a vector

sort( vec.begin(), vec.end() );
vec.erase( unique( vec.begin(), vec.end() ), vec.end() );

Example 2: remove duplicates from vector c++

sort( vec.begin(), vec.end() );
vec.erase( unique( vec.begin(), vec.end() ), vec.end() );