HackerEarth Digital Sequence problem solution

import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.io.FilterInputStream;
import java.io.BufferedInputStream;
import java.io.InputStream;


public class Solution {
    public static void main(String[] args) {
        new Thread(null, new Runnable() {
            public void run() {
                new Solution().solve();
            }
        }, "1", 1 << 26).start();
    }

    void solve() {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        ScanReader in = new ScanReader(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        DIGITIAL_SEQUENCE solver = new DIGITIAL_SEQUENCE();
        solver.solve(1, in, out);
        out.close();
    }

    static class DIGITIAL_SEQUENCE {
        public void solve(int testNumber, ScanReader in, PrintWriter out) {
            int n = in.scanInt();
            int[] ans = new int[10];
            for (int i = 0; i < n; i++) {
                int temp = in.scanInt();
                boolean[] check = new boolean[10];
                while (temp > 0) {
                    check[(temp) % 10] = true;
                    temp /= 10;
                }
                for (int j = 0; j < 10; j++) ans[j] += (check[j] ? 1 : 0);
            }
            int max = 0;
            for (int i = 0; i < 10; i++) max = Math.max(max, ans[i]);
            out.println(max);

        }

    }

    static class ScanReader {
        private byte[] buf = new byte[4 * 1024];
        private int index;
        private BufferedInputStream in;
        private int total;

        public ScanReader(InputStream inputStream) {
            in = new BufferedInputStream(inputStream);
        }

        private int scan() {
            if (index >= total) {
                index = 0;
                try {
                    total = in.read(buf);
                } catch (Exception e) {
                    e.printStackTrace();
                }
                if (total <= 0) return -1;
            }
            return buf[index++];
        }

        public int scanInt() {
            int integer = 0;
            int n = scan();
            while (isWhiteSpace(n)) n = scan();
            int neg = 1;
            if (n == '-') {
                neg = -1;
                n = scan();
            }
            while (!isWhiteSpace(n)) {
                if (n >= '0' && n <= '9') {
                    integer *= 10;
                    integer += n - '0';
                    n = scan();
                }
            }
            return neg * integer;
        }

        private boolean isWhiteSpace(int n) {
            if (n == ' ' || n == 'n' || n == 'r' || n == 't' || n == -1) return true;
            else return false;
        }

    }
}