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- #include <bits/stdc++.h>
- using namespace std;
- #define lli long long int
- #define pb push_back
- int main()
- {
- int q , a , b , c , d;
- cin >> q ;
- while (q--)
- {
- vector <int> v ;
- cin >> a >> b >> c >> d ;
- v.pb(a);
- v.pb(b);
- v.pb(c);
- v.pb(d);
- sort(v.begin(), v.end());
- if ((v[3] - v[2]) % 2 != 0)
- {
- if (__gcd(v[3] , v[2]) != 1)
- {
- cout << v[3] * (v[3] - v[2]) << endl ;
- }
- else
- {
- cout << v[3] * v[2] << endl ;
- }
- }
- else
- {
- cout << v[0] * v[3] << endl ;
- }
- }
- return 0;
- }
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