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SubSequenceString.java
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34 lines (28 loc) · 1017 Bytes
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package Recursion;
import java.util.ArrayList;
public class SubSequenceString {
private static void subSequence(String str, String ans) {
if(str.length() == 0) {
System.out.println(ans);
return;
}
subSequence(str.substring(1), ans+str.charAt(0));
subSequence(str.substring(1), ans);
}
private static ArrayList<String> subSequenceArrayList(String str, String ans) {
if(str.length() == 0) {
// System.out.println(ans);
ArrayList<String> list = new ArrayList<>();
list.add(ans);
return list;
}
ArrayList<String> left = subSequenceArrayList(str.substring(1), ans+str.charAt(0));
ArrayList<String> right = subSequenceArrayList(str.substring(1), ans);
left.addAll(right);
return left;
}
public static void main(String[] args) {
subSequence("abc", "");
System.out.println(subSequenceArrayList("abc", ""));
}
}