func_code_string: #include <bits/stdc++.h>   using namespace std;   long long gcd(long long a, long long b);   void print(long long arr[], long long n);   void printv(vector<long long> arr);   signed main() {     long long t;     cin >> t;     while (t--) {       long long n;       cin >> n;       long long k;       cin >> k;       vector<long long> arr(n);       unordered_map<long long, long long> m;       for (long long i = 0; i < n; i++) {         cin >> arr[i];         m[arr[i]]++;       }       vector<long long> tem = arr;       sort(tem.begin(), tem.end());       set<long long> a, b;       if (arr[0] * 2 != k) a.insert(arr[0]);       for (long long i = 1; i < n; i++) {         if (arr[i] * 2 == k) continue;         if (a.find(k - arr[i]) == a.end())           a.insert(arr[i]);         else           b.insert(arr[i]);       }       long long ii = 0;       for (long long i = 0; i < n; i++) {         if (a.find(arr[i]) != a.end())           cout << 1 <<    ;         else if (b.find(arr[i]) != b.end())           cout << 0 <<    ;         else {           cout << ii <<    ;           ii = (ii + 1) % 2;         }       }       cout <<   n ;     }   }   long long gcd(long long a, long long b) {     if (b == 0) return a;     return gcd(b, a % b);   }   void print(long long arr[], long long n) {     for (long long i = 0; i < n; i++) cout << arr[i] <<    ;     cout <<   n ;   }   void printv(vector<long long> arr) {     for (long long i = 0; i < arr.size(); i++) cout << arr[i] <<    ;     cout <<   n ;   }   