how to delete a element in a vector code example

Example 1: how to remove an element from a vector by value c++

std::vector<int> v; 
// fill it up somehow
v.erase(std::remove(v.begin(), v.end(), 99), v.end()); 
// really remove all elements with value 99

Example 2: remove element by index from vector c++

// Why not setup a lambda you can use again & again
auto removeByIndex = 
  []<class T>(std::vector<T> &vec, unsigned int index)
{
	// This is the meat & potatoes
  	vec.erase(vec.begin() + index);
};

// Then you can throw whatever vector at it you desire
std::vector<std::string> stringvec = {"Hello", "World"};
// Will remove index 1: "World"
removeByIndex(stringvec, 1);
// Vector of integers, we will use push_back
std::vector<unsigned int> intvec;
intvec.push_back(33);
intvec.push_back(66);
intvec.push_back(99);
// Will remove index 2: 99
removeByIndex(intvec, 2);