Auto comment: topic has been updated by Darkrai3112 (previous revision, new revision, compare).

266593387.

You used C++ 17. I changed it to C++ 14 and it did compile, but it got WA on test 2.

vectorarr(n); cin>>arr; You cannot take vector input like this

In C++17 and above, lcm is a function in namespace std. And the compiler may have skipped your custom lcm function and try to consider the std::lcm. You may write like this:

int lccm = accumulate(arr.begin(), arr.end(), 1, lcm<int, int>);

But accumulate will return a int32 type rather a int64 type, which is actually not a big problem in this case since the maximum of possible lcm in this problem won't exceed 1e9. But if you do want the function to behave as you expected, you should write like this:

int lccm = accumulate(arr.begin(), arr.end(), 1ll, lcm<int, int>);

And another bug in your code:

if (sol == lccm) // this should be >=
{
    cout << -1 << endl;
    return;
}