func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     ios_base::sync_with_stdio(0);     cin.tie(0);     int t, n, k;     cin >> t;     while (t--) {       cin >> n >> k;       long long a[n], b[n], c = 0;       for (int i = 0; i < n; i++) cin >> a[i], b[i] = (a[i] % k);       sort(b, b + n);       reverse(b, b + n);       map<long long, long long> mp;       for (int i = 0; i < n && b[i]; i++)         if (i) {           if (b[i - 1] == b[i])             mp[b[i]] += k;           else             mp[b[i]] = k - b[i] + 1;         } else           mp[b[i]] = k - b[i] + 1;       for (auto &it : mp) c = max(c, it.second);       cout << c <<   n ;     }   }   