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순환 스트링 확인
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RotateString.java

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public class RotateString {
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public static void main(String[] args) {
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System.out.println(rotateString("", ""));
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}
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//my solution
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public static boolean rotateString(String A, String B) {
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boolean flag = false;
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if (A.length() != B.length())
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return flag;
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else if (A.length() == 0 && B.length() == 0)
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return true;
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for (int i = 1; i < A.length(); i++) {
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if (A.contains(B.substring(0, i)) && A.contains(B.substring(i, B.length())))
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flag = true;
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else
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continue;
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}
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return flag;
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}
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}
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// best solution
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/*
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class Solution {
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public boolean rotateString(String A, String B) {
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return A.length() == B.length() && (A + A).contains(B);
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}
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}
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*/

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