1 files changed, 20 insertions, 0 deletions
diff --git a/content/string/kmp.cpp b/content/string/kmp.cpp
new file mode 100644
index 0000000..421479e
--- /dev/null
+++ b/content/string/kmp.cpp
@@ -0,0 +1,20 @@
+vector<int> kmpPreprocessing(const string& sub) {
+	vector<int> b(sz(sub) + 1);
+	b[0] = -1;
+	for (int i = 0, j = -1; i < sz(sub);) {
+		while (j >= 0 && sub[i] != sub[j]) j = b[j];
+		b[++i] = ++j;
+	}
+	return b;
+}
+vector<int> kmpSearch(const string& s, const string& sub) {
+	vector<int> result, pre = kmpPreprocessing(sub);
+	for (int i = 0, j = 0; i < sz(s);) {
+		while (j >= 0 && s[i] != sub[j]) j = pre[j];
+		i++; j++;
+		if (j == sz(sub)) {
+			result.push_back(i - j);
+			j = pre[j];
+	}}
+	return result;
+}