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
}

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