What is the usage of c++ vector

c The usage of vector is: 1. Create vector object; 2. Insert numbers at the end; 3. Use subscripts to access elements; 4. Use iterators to access elements; 5. Insert elements; 6.) Delete elements, etc. wait.

In c, vector is a very useful container. The usage of c vector is:

1. Basic operations

(1)Header file#include7d10b7d419803d4062679b4587905232.

(2)Create vector object, vectorbd43222e33876353aff11e13a7dc75f6 vec;

( 3) Insert numbers at the end: vec.push_back(a);

(4) Use subscripts to access elements, cout8c7d64dba6eb821d3deff7eae5231daa

reverse(vec.begin(),vec.end());

Flip the elements (in vector, if two iterators are required in a function, usually neither of the latter is included.)

(2), use sort to sort: header file is required #include< ;algorithm>,

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

(The default is to sort in ascending order, that is, from small to large).

You can compare in descending order by overriding the sort comparison function, as follows:

Definition Sorting comparison function:

bool Comp(const int &a,const int &b)
{
    return a>b;
}

When called: sort(vec.begin(),vec.end(),Comp), this will sort in descending order.

Related learning recommendations: C video tutorial

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