1763C - Another Array Problem - CodeForces Solution

#include <bits/stdc++.h>
using namespace std;
#define ll long long
int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0), cout.tie(0);
    int t = 1;
    cin >> t;
    while (t--) {
        int n;
        cin >> n;
        vector<ll> x(n);
        ll sum = 0, mx = 0;
        for (int i = 0; i < n; i++) {
            cin >> x[i];
            sum += x[i];
            mx = max(mx, x[i]);
        }
        if (n == 2) {
            cout << max(sum, abs(x[0] - x[1]) * 2) << '\n';
            continue;
        }
        if (n == 3) {
            cout << max({sum, max(x[0], x[2]) * 3,abs(x[0]-x[1])*3,abs(x[2]-x[1])*3}) << '\n';
            continue;
        }
        ll ans = mx * n;
        cout << ans << '\n';
    }
}