//me
typedef vector<int> vi;
vi a; a.push_back(10); //init empty vector then fill
vi b(10,0); //init vector with 10 0's
vi c {1,2,3}; //init vector like array
int l[] = {1,2,3}; vi d(l,l+ 3); //init vector with array
vi d1{10,20,30}; vi d2(d1.begin(), d2.end()); //init vector with another
vi e(10); fill(e.begin(), e.end(), 0); //init vector then fill with 0's