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am looking for Data Science Interns with Work From Home opportunity at Meritshot. Anybody who wants to grab this opportunity to work as a Data Science Intern can apply by sharing their resume at career@meritshot.com

You can apply even if you have zero experience in Data Science. You just need to have a willingness to learn and explore Data Science and Machine Learning.
#include<bits/stdc++.h>
using namespace std;

int main() {
    int N, K;
    cin >> N ;

    vector<int> d(N);
    for (int i = 0; i < N; ++i) {
        cin >> d[i];
    }
   
    cin >> K;
   
    int t = 0, r = 0;
    for (int i = 0; i < N; ++i) {
        if (d[i] == 1) {
            ++t;
        } else {
            ++r;
        }
    }

    if (r == 0) {
        cout << "0\n";
        return 0;
    }

    if (r < K) {
        cout << "-1\n";
        return 0;
    }

    int it = 0;
    while (r > 0) {
        r -= K;
        ++it;
    }

    cout << it << "\n";
    return 0;
}

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