initialising a 1D vector using a 2D vector with range constructor code example

Example 1: how to initialize vector in c++ with all elements 0

vector<int> arr(10,0);

Example 2: c++ initialize a vector

#include <bits/stdc++.h> 
#include <vector> 
using namespace std; 
  
int main() 
{ 
// This vector initializes with the values: 10, 20, and 30
  vector<int> vect{ 10, 20, 30 }; 

    return 0; 
}