C++ vector usage

1 Basic operations

(1) Header file #include.

(2) Create vector object, vector vec;

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

(4) Use subscripts to access elements, cout<

(5) Use iterator to access elements.

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3 Algorithm

(1) Use reverse to flip elements: the header file is required #include

reverse(vec.begin(),vec.end()); Element flipping (in vector, if two iterators are required in a function,

generally does not include the latter one.)

(2) Use sort to sort: the header file #include is required,

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 rewriting the sorting comparison function, as follows:

Define the sorting comparison function:

bool Comp(const int &a,const int &b)
{
return a>b;
}
When calling: sort(vec.begin(),vec.end(),Comp), this will sort in descending order

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