func_code_string: #include <bits/stdc++.h>   using namespace std;   const int maxn = 5e5 + 10;   struct edge {     int v, nxt;   } e[maxn << 1];   int head[maxn], ecnt = 0;   void add(int u, int v) { e[++ecnt] = (edge){v, head[u]}, head[u] = ecnt; }   vector<int> p[maxn];   int pos[maxn];   int tree[maxn];   void update(int x, int v) {     for (; x < maxn; x += x & -x) tree[x] += v;   }   long long query(int x) {     long long ret = 0;     for (; x; x -= x & -x) ret += tree[x];     return ret;   }   namespace ACAM {   int son[maxn][26], fail[maxn], cnt;   void insert(char *s, int id) {     int len = strlen(s + 1), u = 0;     p[id].push_back(u);     for (int i = 1; i <= len; i++) {       int c = s[i] -  a ;       if (!son[u][c]) son[u][c] = ++cnt;       u = son[u][c];       p[id].push_back(u);     }     pos[id] = u;   }   void build() {     queue<int> que;     for (int c = 0; c < 26; c++) {       int u = son[0][c];       if (u) que.push(u);     }     while (!que.empty()) {       int u = que.front();       que.pop();       for (int c = 0; c < 26; c++) {         int v = son[u][c];         if (!v)           son[u][c] = son[fail[u]][c];         else           fail[v] = son[fail[u]][c], que.push(v);       }     }     for (int i = 1; i <= cnt; i++) add(fail[i], i);   }   }  // namespace ACAM   int n, q, siz[maxn], dfn[maxn], idx = 0;   char s[maxn];   vector<pair<int, int> > op[maxn];   void dfs(int u) {     siz[u] = 1, dfn[u] = ++idx;     for (int i = head[u]; ~i; i = e[i].nxt) {       int v = e[i].v;       dfs(v);       siz[u] += siz[v];     }   }   long long ans[maxn];   int main() {     memset(head, -1, sizeof(head));     scanf( %d%d , &n, &q);     for (int i = 1; i <= n; i++) {       scanf( %s , s + 1);       ACAM::insert(s, i);     }     ACAM::build();     for (int i = 1; i <= q; i++) {       int k, l, r;       scanf( %d%d%d , &l, &r, &k);       op[l - 1].push_back(make_pair(i, -k));       op[r].push_back(make_pair(i, k));     }     dfs(0);     for (int i = 1; i <= n; i++) {       for (auto t : p[i]) update(dfn[t], 1);       for (auto qr : op[i]) {         int id = qr.first, u = qr.second;         if (u < 0)           u = -u, u = pos[u],           ans[id] -= query(dfn[u] + siz[u] - 1) - query(dfn[u] - 1);         else           u = pos[u], ans[id] += query(dfn[u] + siz[u] - 1) - query(dfn[u] - 1);       }     }     for (int i = 1; i <= q; i++) printf( %lld n , ans[i]);   }   