#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; }
//vector<int> A; reverse(A.begin(),A.end());
//Reverse vector partially (from index x to index y) reverse(v.begin()+x, v.begin()+y+1);
vector<int> a = {1,2,3,4,5,6}; reverse(a.begin(), a.end());
reverse(start_index, last_index);