func_code_string: #include <bits/stdc++.h>   using namespace std;   template <typename... T>   inline void inp(T &...args) {     ((cin >> args), ...);   }   template <typename T>   inline istream &operator>>(istream &in, vector<T> &a) {     for (auto &x : a) in >> x;     return in;   }   template <typename T, typename U>   inline istream &operator>>(istream &in, pair<T, U> &a) {     in >> a.first >> a.second;     return in;   }   void solve(int &T) {     long long int n, k;     cin >> n >> k;     vector<long long int> a(n);     cin >> a;     map<long long int, long long int> m;     for (long long int i = (0); ((1) > 0 ? i < (n) : i > (n)); i += (1)) {       m[a[i]]++;     }     set<long long int> s;     for (long long int i = (0); ((1) > 0 ? i < (n) : i > (n)); i += (1)) {       if (a[i] <= k) {         long long int x = a[i];         long long int y = k - a[i];         if (m.count(y) and !s.count(min(x, y))) {           if (x == y and m[y] >= 2) {             s.insert(min(x, y));           } else             s.insert(min(x, y));         }       }     }     11;     int ok = 1;     vector<long long int> ans(n, 0);     for (long long int i = (0); ((1) > 0 ? i < (n) : i > (n)); i += (1)) {       if (s.count(a[i])) {         ans[i] = 1;         if (k % 2 == 0 and a[i] == k / 2) {           ans[i] = ok;           ok ^= 1;         }       }     }     for (auto &X : ans) {       cout << X <<    ;     }     cout <<   n ;   }   int main() {     ios::sync_with_stdio(false);     cin.tie(0);     int t = 1;     cin >> t;     for (int i = 1; i <= t; i++) {       if (0) cerr <<  Case #  << i <<   n ;       solve(i);     }     return 0;   }   