From a608ebd2c070fbb58a51c94ce7f523b67453fdd7 Mon Sep 17 00:00:00 2001
From: Ren Baoshuo <i@baoshuo.ren>
Date: Sun, 3 Oct 2021 08:35:29 +0800
Subject: [PATCH] =?UTF-8?q?142.=20=E5=89=8D=E7=BC=80=E7=BB=9F=E8=AE=A1?=
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https://www.acwing.com/problem/content/submission/code_detail/8017084/
---
 AcWing/142/142.cpp | 51 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 51 insertions(+)
 create mode 100644 AcWing/142/142.cpp

diff --git a/AcWing/142/142.cpp b/AcWing/142/142.cpp
new file mode 100644
index 00000000..64eef625
--- /dev/null
+++ b/AcWing/142/142.cpp
@@ -0,0 +1,51 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+
+int n, m, ans;
+string s;
+
+struct node {
+    int size;
+    node* next[26];
+
+    ~node() {
+        for (auto& i : next) {
+            delete i;
+        }
+    }
+};
+
+void insert(node* root, string s) {
+    if (s.empty()) {
+        root->size++;
+        return;
+    }
+    if (root->next[s[0] - 'a'] == nullptr) root->next[s[0] - 'a'] = new node();
+    insert(root->next[s[0] - 'a'], s.substr(1));
+}
+
+int query(node* root, string s) {
+    if (s.empty()) return root->size;
+    if (root->next[s[0] - 'a'] == nullptr) return 0;
+    return query(root->next[s[0] - 'a'], s.substr(1));
+}
+
+int main() {
+    node* root = new node();
+    cin >> n >> m;
+    for (int i = 1; i <= n; i++) {
+        cin >> s;
+        insert(root, s);
+    }
+    for (int i = 1; i <= m; i++) {
+        ans = 0;
+        cin >> s;
+        for (int j = 1; j <= s.size(); j++) {
+            ans += query(root, s.substr(0, j));
+        }
+        cout << ans << endl;
+    }
+    delete root;
+    return 0;
+}