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B - AND Sorting
https://codeforces.com/contest/1682/submission/158031002
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Codeforces/1682/B/B.cpp
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Codeforces/1682/B/B.cpp
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#include <algorithm>
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#include <iostream>
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using std::cin;
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using std::cout;
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const char endl = '\n';
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int t, n;
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int main() {
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std::ios::sync_with_stdio(false);
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cin >> t;
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while (t--) {
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cin >> n;
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int ans = -1;
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for (int i = 0, x; i < n; i++) {
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cin >> x;
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if (x != i) ans &= x;
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}
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cout << ans << endl;
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}
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return 0;
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}
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