题解 | 单组_二维字符数组

using System.Collections.Generic;
public class Program {
    public static void Main() {
        string[] s=System.Console.ReadLine().Split();
        int n = int.Parse(s[0]);
        int m = int.Parse(s[1]);
        Stack<string> st=new Stack<string>();
        for(int i=0;i<n;i++)
        {
            string line = System.Console.ReadLine();
            char[] cs = line.ToCharArray();
            int p1 = 0;
            int p2 = m - 1;
            while (p1 < p2) 
            {
                char temp = cs[p1];
                cs[p1] = cs[p2];
                cs[p2] = temp;
                p1++;
                p2--;
            }
            st.Push(new string(cs));
        }
        for(int j=0;j<n;j++)
        {
            System.Console.WriteLine(st.Pop());
        }
        
    }
}