vector init c++
#include <bits/stdc++.h>
using namespace std;
int main(){
vector<int> a(10,0); //init a vector with 10 zero's
vector<int> b{1,2,3}; //init a vector with values 1,2,3
vector<int> c(5); //init a vector with length 10
vector<int> d; //init a vector
}