Predicates and Filtering (std::copy_if)

Medium Lambda Expressions

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Problem Statement

Write a C++ program using `std::copy_if` with a lambda predicate to filter out only even numbers from a vector.

Input Format

First line: N. Second line: N space-separated integers.

Output Format

Print filtered even numbers separated by a space.

Constraints

1 <= N <= 1000

Sample Input

6
1 2 3 4 5 6

Sample Output

2 4 6

Explanation

Lambda predicates evaluate boolean conditions to filter elements in algorithms.

Starter Code

#include <iostream>
#include <vector>
#include <algorithm>
#include <iterator>

int main() {
    int n;
    if (std::cin >> n) {
        std::vector<int> vec(n);
        for (int i = 0; i < n; i++) std::cin >> vec[i];
        // Write your std::copy_if predicate logic here
    }
    return 0;
}

Limits

Time Limit: 1s
Memory Limit: 256MB

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