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Çàäà÷à

   int n, m;
    cin >> n >> m;
    vector arr(n), sums;
    for (int i = 0; i < n; i++)
        cin >> arr[i];
    for (int i = 0; i < n; i += m) {
        int sum = 0;
        for (int j = 0; j < m; j++) {
            if (i + j >= n) break;
            sum += arr[i + j];
        }
        sums.push_back(sum);
    }