#include using namespace std; #define GET_MACRO(_1, _2, _3, NAME, ...) NAME #define _repl(i,a,b) for(int i=(int)(a);i<(int)(b);i++) #define _rep(i,n) _repl(i,0,n) #define rep(...) GET_MACRO(__VA_ARGS__, _repl, _rep)(__VA_ARGS__) #define mp(a,b) make_pair((a),(b)) #define pb(a) push_back((a)) #define all(x) (x).begin(),(x).end() #define uniq(x) sort(all(x)),(x).erase(unique(all(x)),end(x)) #define fi first #define se second #define dbg(...) _dbg(#__VA_ARGS__, __VA_ARGS__) void _dbg(string){cout< void _dbg(string s,H h,T... t){int l=s.find(',');cout< ostream& operator<<(ostream &o, const pair &p){o<<"("< ostream& operator<<(ostream &o, const vector &v){o<<"[";for(T t:v){o<>n; vector v(n); rep(i,n) cin>>v[i]; set s(all(v)); long x,y; cin>>x>>y; long goal = abs(x) + abs(y); if(x==0 && y==0){ cout << 0 << endl; return 0; } if(s.count(goal)){ cout << 1 << endl; return 0; } else { rep(i,n){ if(s.count(abs(goal - v[i])) || s.count(goal + v[i])){ cout << 2 << endl; return 0; } } } cout << -1 << endl; return 0; return 0; }