题解 | 翻之

import java.util.*;

import java.io.*;
// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) throws Exception {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        String nm = br.readLine();
        String[] arr = nm.split(" ");
        int m = Integer.valueOf(arr[0]);
        int n = Integer.valueOf(arr[1]);
        char[][] num = new char[m][n];


        for (int i = 0; i < m; i++) {
            String str = br.readLine();
            for (int j = 0; j < n; j++) {
                num[i][j] = str.charAt(j);
            }
        }

        Map<String, Integer> dict = new HashMap<>();

        for (int i = 0; i < n; i++) {
            StringBuilder sbr = new StringBuilder();
            for (int j = 0; j < m; j++) {
                sbr.append(num[j][i]);
            }
            String key = sbr.toString();
            if (!dict.containsKey(key)) {
                dict.put(key, 1);
            } else {
                dict.put(key, dict.get(key) + 1);
            }
        }

        Integer max = dict.values().stream().max((a, b) -> a - b).get();
        System.out.println(max);
    }
}