func_code_string: #include <bits/stdc++.h>   const long long inf = 0x3f3f3f3f;   using namespace std;   const long long maxn = 2e5 + 100;   long long n, k;   long long a[maxn];   int32_t main() {     long long q;     scanf( %lld , &(q));     while (q--) {       scanf( %lld%lld , &(n), &(k));       long long maxx = 0, minn = 0x3f3f3f3f;       for (long long i = (1); i <= (n); i++) {         scanf( %lld , &(a[i]));         if (maxx < a[i]) maxx = a[i];         if (minn > a[i]) minn = a[i];       }       long long x = minn + k;       if (abs(x - maxx) > k)         printf( -1 );       else         printf( %lld , (x));       printf(  n );     }     return 0;   }   