func_code_string: #include <bits/stdc++.h>   using namespace std;   struct edge {     int v, w;     edge* next;   };   const int N = 100010;   int n, p, ordcnt;   bool vis[N], cut[N];   int ord[N], sum[N], mex[N], q[N], dep[N], digit[N], rdigit[N], rprod[N],       prod[N];   edge* g[N];   void add_edge(int u, int v, int w);   void calc_order(int u);   void calc_sum(int u);   void dfs(int u);   long long calc(int u);   int rev(int a);   void ex_gcd(int a, int b, int& x, int& y);   int main() {     long long ans = 0;     scanf( %d%d , &n, &p);     for (int rep = 1; rep < n; ++rep) {       int u, v, w;       scanf( %d%d%d , &u, &v, &w);       add_edge(u, v, w);       add_edge(v, u, w);     }     prod[0] = 1;     rprod[0] = 1;     rprod[1] = rev(10);     for (int i = 1; i <= n; ++i) prod[i] = 10LL * prod[i - 1] % p;     for (int i = 2; i <= n; ++i)       rprod[i] = (long long)rprod[1] * rprod[i - 1] % p;     calc_order(0);     memset(cut, 0, sizeof(cut));     for (int i = 0; i < n; ++i) {       int u = ord[i];       dep[u] = 0;       digit[u] = 0;       rdigit[u] = 0;       dfs(u);       ans += calc(u);       cut[u] = true;       for (edge* p = g[u]; p; p = p->next)         if (!cut[p->v]) ans -= calc(p->v);       ans -= 1;       ;     }     printf( %lld n , ans);     return 0;   }   int rev(int a) {     int x, y;     ex_gcd(a, p, x, y);     if (x < 0) x += p;     return x;   }   void ex_gcd(int a, int b, int& x, int& y) {     if (b == 0) {       x = 1;       y = 0;       return;     }     ex_gcd(b, a % b, y, x);     y -= a / b * x;   }   long long calc(int u) {     int ql = 0, qr = 1;     long long ret = 0;     map<int, int> mp;     q[0] = u;     while (ql < qr) {       int v = q[ql++];       vis[v] = true;       map<int, int>::iterator it = mp.find(rdigit[v]);       if (it != mp.end())         ++it->second;       else         mp.insert(make_pair(rdigit[v], 1));       for (edge* p = g[v]; p; p = p->next)         if (!vis[p->v] && !cut[p->v]) q[qr++] = p->v;     }     for (int i = 0; i < qr; ++i) vis[q[i]] = false;     for (int i = 0; i < qr; ++i) {       int key = (long long)-digit[q[i]] * rprod[dep[q[i]]] % p;       if (key < 0) key += p;       map<int, int>::iterator it = mp.find(key);       if (it != mp.end()) {         ;         ret += it->second;       }     }     return ret;   }   void dfs(int u) {     vis[u] = true;     for (edge* p = g[u]; p; p = p->next)       if (!vis[p->v] && !cut[p->v]) {         dep[p->v] = dep[u] + 1;         rdigit[p->v] = ((long long)prod[dep[u]] * p->w + rdigit[u]) % ::p;         digit[p->v] = (digit[u] * 10LL + p->w) % ::p;         dfs(p->v);       }     vis[u] = false;   }   void calc_order(int u) {     calc_sum(u);     int s = sum[u], ql = 0, qr = 1;     q[0] = u;     while (ql < qr) {       int v = q[ql++];       vis[v] = true;       mex[v] = max(mex[v], s - sum[v]);       if (mex[v] < mex[u]) u = v;       for (edge* p = g[v]; p; p = p->next)         if (!vis[p->v] && !cut[p->v]) q[qr++] = p->v;     }     for (int i = 0; i < qr; ++i) vis[q[i]] = false;     ord[ordcnt++] = u;     cut[u] = true;     for (edge* p = g[u]; p; p = p->next)       if (!cut[p->v]) calc_order(p->v);   }   void calc_sum(int u) {     vis[u] = true;     mex[u] = 0;     sum[u] = 1;     for (edge* p = g[u]; p; p = p->next)       if (!vis[p->v] && !cut[p->v]) {         calc_sum(p->v);         sum[u] += sum[p->v];         mex[u] = max(mex[u], sum[p->v]);       }     vis[u] = false;   }   void add_edge(int u, int v, int w) {     static edge pool[N * 2];     static edge* p = pool;     ++p;     p->v = v;     p->w = w;     p->next = g[u];     g[u] = p;   }   