Check out example codes for "c++ reverse part of vector". It will help you in understanding the concepts better.

Code Example 1

#include <bits/stdc++.h> // Vector
#include <algorithm>  // Reverse 
using namespace std;

int main()
{
    vector<int> nums{4,1,2,1,2};

    reverse(nums.begin(), nums.end());
    return 0;
}

Code Example 2

reverse(start_index, last_index);

Code Example 3

reverse(start_index, last_index);

Code Example 4

//Reverse vector partially (from index x to index y)
reverse(v.begin()+x, v.begin()+y+1);

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