#include #include #include using namespace std; int main(){ int n; cin >> n; bool flag = 0; vector a(n); vector s(n+1); vector res(n); for(int i=0;i> a[i]; s[i] = a[i]; } for(int i=n-2;i>=0;i--){ s[i]^= s[i+1]; } for(int i=n-1;i>=0;i--){ set st; for(int j=i;j