1206B - Make Product Equal One - CodeForces Solution

#include <iostream>
#include <vector>
#include <algorithm>

using namespace std;

using ll = long long;

void resolve() {
    ll n;
    cin >> n;
    ll res = 0;
    ll cntNeg = 0;
    bool wasZero = false;
    for (ll i = 0; i < n; ++i) {
        ll x;
        cin >> x;
        res += abs(abs(x) - 1);
        cntNeg += x < 0;

        if (!x) {
            wasZero = true;
        }
    }

    res += ((cntNeg & 1) << 1LL) * (!wasZero);
    cout << res << '\n';
}

int32_t main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);
    resolve();
    return 0;
}