Question

How to shift vector elements to left by N positions in C++

Answer 1

#include <iostream>
#include <vector>
#include <algorithm>
 
int main()
{   
    std::vector<int> v = {1, 2, 3, 4, 5, 6, 7, 8, 9};
 
    int N = 3;
    
    // rotate to left
    std::rotate(v.begin(), v.begin() + N, v.end());
 
    for (int i = 0; i < v.size(); i++) {
        std::cout << v[i] <<  " ";
    }
}    
 
  
  
  
  
/*
run:
  
4 5 6 7 8 9 1 2 3 
  
*/

 

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