Removing Elements (std::remove_if)

Medium STL Algorithms

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Problem Statement

Write a C++ program using `std::remove_if` and vector `erase` idiom to remove all negative numbers from a vector.

Input Format

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

Output Format

Print filtered positive/zero elements separated by a space.

Constraints

1 <= N <= 1000

Sample Input

5
-1 10 -2 20 30

Sample Output

10 20 30

Explanation

Combines `std::remove_if` with container `erase` (the erase-remove idiom) to delete elements matching a predicate.

Starter Code

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

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 remove_if and erase idiom logic here

    }
    return 0;
}

Limits

Time Limit: 1s
Memory Limit: 256MB

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