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int findmaximumPackages(vector<int>&arr)
{
    int n = arr.size();
    int mx = *max_element(arr.begin(), arr.end());
    mx = mx * 2;
    int res = 0;
    map<int, int>mp;
    for (auto it : arr) {
        mp[it]++;
    }
    for (int i = 1; i <= mx; i++) {
        int sm = 0;
        for (int j = 1; j <= (i - 1) / 2; j++) {
            sm += min(mp[j], mp[i - j]);
        }
        if (i % 2 == 0) {
            sm += (mp[i / 2] / 2);
        }
        res = max(res, mp[i] + sm);
    }
    return res;
}

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public static long getMaxXor(long n) {
    if (n == 0) {
        return 0;
    }
    int x = 0;
    while (n >> x > 0) {
        x++;
    }
    return (1L << x) - 2;
    
   }

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