/C++/How to allocate memory for vector c++

How to allocate memory for vector c++

std::vector<int> vec1;
vec1.reserve(30);  // Allocate space for 30 items, but vec1 is still empty.

std::vector<int> vec2;
vec2.resize(30);  // Allocate space for 30 items, and vec2 now contains 30 items.

Source: stackoverflow.com

Similar codes

0 vote216 views1 answer
Push_back a pair c++
C++
0 vote215 views1 answer
C++ std map initializer list
C++
0 vote219 views1 answer
How to create a min priority queue of pair of int, int
C++
0 vote224 views1 answer
Std vector c++
C++
0 vote292 views1 answer
Two dimensional array A[N,M] with the random numbers from 10 to 90.
C++
4 votes218 views3 answers
C++ how to get maximum value
C++
0 vote255 views1 answer
Fast input and output c++
C++
2 votes220 views1 answer
C++ custom comparator for elements in set
C++
0 vote218 views1 answer
C++ conditional typedef
C++
0 vote231 views1 answer
Arduino jumper programmieren
C++