[Solved] Passing vector by reference: Segmentation fault [duplicate]

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You need to go from l to m when filling vector L:

void merge(vector<int>& a, int l, int m, int r) {
    vector<int> L;
    vector<int> R;

    for (int i = l; i <= m; i++)
        L.push_back(a[i]);
    ...
}

Otherwise L contains additional elements outside the range of interest. Then, index k steps off the end of vector a when iterating for the size of L.

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solved Passing vector by reference: Segmentation fault [duplicate]