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int getMinimumTrips(vector<int> weights) {
    map<int, int> m;
    for (auto x : weights) {
        m[x]++;
    }

    int ans = 0;
    for (auto x : m) {
        if (x.second == 1) return -1;
        ans += ceil(x.second / 3.0);
    }
    return ans;
}

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