题解 | 翻之

import java.util.HashMap;
import java.util.Scanner;

// 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) {
        Scanner in = new Scanner(System.in);
        // 注意 hasNext 和 hasNextLine 的区别
        while (in.hasNextLine()) { // 注意 while 处理多个 case
            // int a = in.nextInt();
            // int b = in.nextInt();
            // System.out.println(a + b);
            String nm = in.nextLine();
            String[] nms = nm.split(" ");
            int n = Integer.parseInt(nms[0]);
            int m = Integer.parseInt(nms[1]);
            char[][] arr = new char[n][m];
            for (int i=0;i<n;i++){
                String l = in.nextLine();
                for(int j=0;j<m;j++){
                    arr[i][j] = l.charAt(j);
                }
            }

            HashMap<String, Integer> map = new HashMap<>();
            for (int j=0;j<m;j++) {
                StringBuilder sb = new StringBuilder();
                for (int i=0;i<n;i++){
                    sb.append(arr[i][j]);
                }
                map.put(sb.toString(), map.getOrDefault(sb.toString(),0)+1);
            }

            int[] ret = {0};
            map.forEach((k,v) -> {
                ret[0] = Math.max(ret[0], v);
            });
            System.out.println(ret[0]);
        }
    }
}