Common Child.java

import java.io.*;
import java.math.*;
import java.security.*;
import java.text.*;
import java.util.*;
import java.util.concurrent.*;
import java.util.regex.*;

public class Solution {

    // Complete the commonChild function below.
    static int commonChild(String s1, String s2) {
    int[][] C = new int[s1.length()+1][s2.length()+1];

        for (int i = 0; i < s1.length(); i++) {
            for (int j = 0; j < s2.length(); j++) {
                if (s1.charAt(i) == s2.charAt(j)) {
                    C[i+1][j+1] = C[i][j] + 1;
                } else {
                    C[i+1][j+1] = Math.max(C[i+1][j], C[i][j+1]);
                }
            }
        }
        for (int i = 0; i < s1.length(); i++) {
        }

        return C[s1.length()][s2.length()];

    }

    private static final Scanner scanner = new Scanner(System.in);

    public static void main(String[] args) throws IOException {
        BufferedWriter bufferedWriter = new BufferedWriter(new                           FileWriter(System.getenv("OUTPUT_PATH")));

        String s1 = scanner.nextLine();

        String s2 = scanner.nextLine();

        int result = commonChild(s1, s2);

        bufferedWriter.write(String.valueOf(result));
        bufferedWriter.newLine();

        bufferedWriter.close();

        scanner.close();
    }
}