func_code_string: #include <bits/stdc++.h>   int dx[] = {0, 0, 1, -1};   int dy[] = {1, -1, 0, 0};   using namespace std;   vector<long long int> v, v2, v3;   vector<long long int>::iterator it1, it2;   int ar[200];   int main() {     long long int tcase = 1;     while (tcase--) {       long long int n, k, a, ans = 0;       scanf( %lld %lld , &n, &k);       for (int i = 0; i < n; i++) {         scanf( %lld , &a);         ar[a % k]++;       }       ans += ar[0] / 2;       ar[0] = 0;       for (int i = 1; i <= (k / 2) + 1; i++) {         if (ar[i]) {           if (ar[k - i] && i != (k - i)) {             ans += min(ar[i], ar[k - i]);             ar[i] = ar[k - i] = 0;           } else if (ar[k - i] && (i == k - i)) {             ans += ar[i] / 2;             ar[i] = 0;           }         }       }       printf( %lld n , 2 * ans);     }   }   