Iterator Arithmetic

Medium STL Iterators

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Problem Statement

Write a C++ program demonstrating iterator arithmetic (`it + n`, `it – n`, `it2 – it1`) to access vector elements directly.

Input Format

First line: N. Second line: N space-separated integers. Third line: Index offset K.

Output Format

Print element accessed via `begin() + K`.

Constraints

1 <= N <= 1000, 0 <= K < N

Sample Input

5
10 20 30 40 50
2

Sample Output

Explanation

Random-access iterators support arithmetic operations for instant jumping between positions.

Starter Code

#include <iostream>
#include <vector>

int main() {
    int n, k;
    if (std::cin >> n) {
        std::vector<int> vec(n);
        for (int i = 0; i < n; i++) std::cin >> vec[i];
        if (std::cin >> k) {
            // Write your iterator arithmetic access logic here

        }
    }
    return 0;
}

Limits

Time Limit: 1s
Memory Limit: 256MB

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