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source/String/KMP.cpp

@@ -0,0 +1,17 @@
+int fail[N]; // N : s의 최대 길이
+vi kmp(char obj[], char s[]) {
+    vi ret;
+    for(int i = 1, j = 0; s[i]; i++) {
+        fail[i] = 0;
+        while(j > 0 and s[i] != s[j]) j = fail[j-1];
+        if(s[i] == s[j]) fail[i] = ++j;
+    }
+    for(int i = 0, j = 0; obj[i]; i++) {
+        while(j > 0 and obj[i] != s[j]) j = fail[j-1];
+        if(obj[i] == s[j]) {
+            if(s[j+1]) j++;
+            else ret.push_back(i-j), j = fail[j];
+        }
+    }
+    return ret;
+}