string fairRations(vector<int> B) {
    int cost = 0;
    int oddIndex = -1;
    
    for (size_t i = 0; i < B.size(); i++) {
        if (B[i] % 2 == 0) {
            continue;
        }
        // Everything from here is ODD...
        if (oddIndex == -1) {
            oddIndex = i;
            continue;
        }
        // Odd Index is never -1 after this...
        cost = cost + i - oddIndex;
        oddIndex = -1;
    }
    
    if (oddIndex != -1) {
        return "NO";
    }
    
    return to_string(cost * 2);
}