From 4022e5c95210631e4aceb08eaf9d9071aa5aefc4 Mon Sep 17 00:00:00 2001
From: Richard Qin <richard.qin.001@gmail.com>
Date: Tue, 15 Sep 2026 08:16:43 +0800
Subject: Set up a git repo

---
 tests/sysy_lvX/079_kmp.sy | 62 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 62 insertions(+)
 create mode 100644 tests/sysy_lvX/079_kmp.sy

(limited to 'tests/sysy_lvX/079_kmp.sy')

diff --git a/tests/sysy_lvX/079_kmp.sy b/tests/sysy_lvX/079_kmp.sy
new file mode 100644
index 0000000..b3dd7a9
--- /dev/null
+++ b/tests/sysy_lvX/079_kmp.sy
@@ -0,0 +1,62 @@
+
+void get_next(int str[], int next[])
+{
+    next[0] = -1;
+    int i = 0, j = -1;
+    while (str[i]) {
+        if (j == -1 || str[i] == str[j]) {
+            j = j + 1;
+            i = i + 1;
+            next[i] = j;
+        }
+        else
+            j = next[j];
+    }
+}
+
+int KMP(int dst[], int src[])
+{
+    int next[4096];
+    get_next(dst, next);
+
+    int i = 0, j = 0;
+    while (src[j]) {
+        if (dst[i] == src[j]) {
+            i = i + 1;
+            j = j + 1;
+            if (!dst[i]) {
+                return j;
+            }
+        } else {
+            i = next[i];
+            if (i == -1) {
+                i = i + 1;
+                j = j + 1;
+            }
+        }
+    }
+    return -1;
+}
+
+int read_str(int buf[])
+{
+    int i = 0;
+    while (1) {
+        buf[i] = getch();
+        if (buf[i] == 10)
+            break;
+        i = i + 1;
+    }
+    buf[i] = 0;
+    return i;
+}
+
+int main()
+{
+    int dst[4096], src[4096];
+    read_str(dst);
+    read_str(src);
+    putint(KMP(dst, src));
+    putch(10);
+    return 0;
+}
\ No newline at end of file
-- 
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