Replace bool[] arrays with vector

I believe the error is thrown by the "isGov" array, in which you have possibly not assigned values to all elements, but later attempt to access all of them. But since in arrays, the initial value is random, it is not recognized as a boolean value and causes an error.

I would suggest either using a vector or setting all values to false initially.

In which order is this evaluated? if (v[i].size() == 0 && !isGov[i])

The problem is not that, I think using vector instead of bool [] will work, or you can use memset and initialize all values of isGov as false at the beginning.

In your code isGov is uninitialized

bool isGov[n+1];

should be replaced with

bool isGov[n+1]{};

You should use a vector though as others have suggested.