Dynamically Create Array and initialization of all element with minnus 1 (-1)

Question

I know how to create array Dynamically, but I wants to initialization of every element with negative one (-1)

Answer 1

std::vector accepts a second parameter for the value to use to initialize elements:

std::vector<int> mydata(1000, -1); // 1000 elements, each initialized to -1

Answer 2

std::vector has a constructor that takes a size and a value to use as an initializer:

// create a vector of 10 integers with the value -1
std::vector<int> v(10, -1);