func_code_string: #include <bits/stdc++.h>   using namespace std;   const int maxn = 2e5 + 7;   const int sz = 10;   map<int, int> mp[11];   int n, k;   unsigned long long a[maxn], ans;   unsigned long long fac[13];   int main() {     fac[0] = 1;     for (int i = 1; i <= 10; i++) fac[i] = 10LL * fac[i - 1];     scanf( %d%d , &n, &k);     for (int i = 1; i <= n; i++) {       scanf( %llu , &a[i]);       for (int j = 1; j <= 10; j++) {         int now = (a[i] * fac[j]) % k;         mp[j][now]++;       }     }     for (int i = 1; i <= n; i++) {       int len = 0;       unsigned long long now = a[i];       while (now) {         now /= 10;         len++;       }       int res = a[i] % k;       int p = 0;       if (res == 0) {         int need = 0;         if ((a[i] * fac[len]) % k == need) {           ans += mp[len][need] - 1;         } else {           ans += mp[len][need];         }       } else {         int need = k - res;         if ((a[i] * fac[len]) % k == need) {           ans += mp[len][need] - 1;         } else {           ans += mp[len][need];         }       }     }     printf( %lld n , ans);   }   