func_code_string: #include <bits/stdc++.h>   using namespace std;   #define TC 1   #define IOS ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);   #define deb(...)   [  << #__VA_ARGS__  :   << (__VA_ARGS__) <<  ]     using ll = long long;      template <typename T>   vector<T> readArr(int n) {       vector <T> v(n);       for (auto &it : v)           cin >> it;       return v;   }      void init() {       ;   }      const int N = 1e5+ 5;      void solve() {       int n, m; cin >> n >> m;              vector <int> v = readArr<int>(n);              for (int &x: v)           x = x % m;              vector <int> ct(N);       for (int x: v)           ct[x]++;                  int res = (ct[0] > 0 ? 1 : 0);     //  cout << deb(res) <<   n ;       for (int i=1; i<=m/2; i++) {           int j = m - i;           if (i == j) {               res += (ct[j] > 0 ? 1 : 0);              // cout << deb(i) deb(res) <<   n ;               continue;           }           int a = ct[i], b = ct[j];           if (a > 0 && b > 0) {               res++;               if (a <= b) {                   ct[i] = 0;                   ct[j] -= (a+1);                   ct[j] = max(ct[j], 0);               } else {                   ct[j] = 0;                   ct[i] -= (b+1);                   ct[i] = max(ct[i], 0);               }           }                                 res += ct[i];           res += ct[j];                     // cout << deb(i) deb(j) deb(res) <<   n ;       }       cout << res <<   n ;   }      int main() {       IOS       init();       int t = 1;       if (TC)           cin >> t;          while (t--) {           solve();       }   }   