new file: P10976.cpp

P10976.cpp

@@ -0,0 +1,45 @@
+#include <bits/stdc++.h>
+using namespace std;
+int main()
+{
+    // freopen("repetitions.in", "r", stdin);
+    // freopen("repetitions.out", "w", stdout);
+    string s1, s2;
+    long long n1, n2;
+    while (cin >> s2 >> n2 >> s1 >> n1)
+    {
+        int len1 = s1.size(), len2 = s2.size();
+        // 预处理：对 s2 的每个起始位置 j，扫描一遍 s1 后得到：
+        // nxt[j] = 结束时在 s2 中的位置
+        // cnt[j] = 期间完整匹配了多少个 s2
+        vector<int> nxt(len2);
+        vector<long long> cnt(len2, 0);
+        for (int j = 0; j < len2; j++)
+        {
+            int pos = j;
+            for (int i = 0; i < len1; i++)
+            {
+                if (s1[i] == s2[pos])
+                {
+                    pos++;
+                    if (pos == len2)
+                    {
+                        cnt[j]++;
+                        pos = 0;
+                    }
+                }
+            }
+            nxt[j] = pos;
+        }
+        // 模拟 n1 轮，每轮用预处理结果 O(1) 转移
+        long long total = 0;
+        int cur = 0;
+        for (long long i = 0; i < n1; i++)
+        {
+            total += cnt[cur];
+            cur = nxt[cur];
+        }
+        cout << total / n2 << endl;
+    }
+    return 0;
+}