C++ vector usage

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, cout531e9d7e0cc320e12d05feadcf5805a2

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 #includee23c27865115669ba6cc99530e9d22b3 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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