문제
풀이
#include <iostream>
using namespace std;
void solve(void) {
long long a, b, n; cin >> a >> b >> n;
long long c = (n + 1) / 2, d = n / 2;
cout << (a * c + b * d) * (a * d + b * c) << "\n";
}
int main(void) {
ios::sync_with_stdio(false);
cin.tie(nullptr);
int t; cin >> t;
while (t--) solve();
return 0;
}