#include using namespace std; typedef signed long long ll; #define _P(...) (void)printf(__VA_ARGS__) #define FOR(x,to) for(x=0;x<(to);x++) #define FORR(x,arr) for(auto& x:arr) #define FORR2(x,y,arr) for(auto& [x,y]:arr) #define ALL(a) (a.begin()),(a.end()) #define ZERO(a) memset(a,0,sizeof(a)) #define MINUS(a) memset(a,0xff,sizeof(a)) template bool chmax(T &a, const T &b) { if(a bool chmin(T &a, const T &b) { if(a>b){a=b;return 1;}return 0;} //------------------------------------------------------- int N; int ret=0; void solve() { int i,j,k,l,r,x,y; string s; multiset S; S.insert(0); cin>>N; FOR(i,N) { cin>>x; x^=ret; S.insert(x); S.insert(x); S.erase(S.find(*S.rbegin())); cout<<*S.rbegin()<