Java LCS LCS(String A, String B)

Description

LCS

License

Apache License

Declaration

public static int LCS(String A, String B) 

Method Source Code

//package com.java2s;
/**//from   w  w  w . j  a va2s  .co m
 * Copyright 2015-2016 Debmalya Jash
 * <p/>
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * <p/>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p/>
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

public class Main {
    public static int LCS(String A, String B) {
        if (A.length() == 0 || B.length() == 0) {
            return 0;
        }
        int lenA = A.length();
        int lenB = B.length();
        // check if last characters are same
        if (A.charAt(lenA - 1) == B.charAt(lenB - 1)) {
            // Add 1 to the result and remove the last character from both
            // the strings and make recursive call to the modified strings.
            return 1 + LCS(A.substring(0, lenA - 1), B.substring(0, lenB - 1));
        } else {
            // Remove the last character of String 1 and make a recursive
            // call and remove the last character from String 2 and make a
            // recursive and then return the max from returns of both recursive
            // calls
            return Math.max(LCS(A.substring(0, lenA - 1), B.substring(0, lenB)),
                    LCS(A.substring(0, lenA), B.substring(0, lenB - 1)));
        }
    }
}

Related

1. lcs(char[] A, char[] B)
2. lcs(char[] inputString1, char[] inputString2, int length1, int length2)
3. LCS(String a, String b)
4. lcs(String a, String b)
5. lcs(String a, String b)
6. lcs(String arg0, String arg1)
7. LCS(String input1, String input2)