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org/cpp/tricks/tricks.org

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+#+title: C++ Tricks
+
+* Rotate String Check :string:trick:search:
+:PROPERTIES:
+:ANKI_NOTE_TYPE: Basic
+:ANKI_NOTE_ID: 20260504001
+:END:
+** Front
+How to check if string ~s~ can be rotated to match string ~goal~ in O(n)?
+** Back
+#+begin_src c++
+bool rotateString(string s, string goal) {
+    return s.size() == goal.size() && (s + s).find(goal) != string::npos;
+}
+#+end_src
+
+If ~goal~ is a substring of ~s + s~, then ~s~ can be rotated to match ~goal~.