02-线性结构4 Pop Sequence （25 分）

Posted 2021-01-09 interim

02-线性结构4 Pop Sequence （25 分）

Given a stack which can keep M numbers at most. Push N numbers in the order of 1, 2, 3, ..., N and pop randomly. You are supposed to tell if a given sequence of numbers is a possible pop sequence of the stack. For example, if M is 5 and N is 7, we can obtain 1, 2, 3, 4, 5, 6, 7 from the stack, but not 3, 2, 1, 7, 5, 6, 4.

Input Specification:

Each input file contains one test case. For each case, the first line contains 3 numbers (all no more than 1000): M (the maximum capacity of the stack), N(the length of push sequence), and K (the number of pop sequences to be checked). Then K lines follow, each contains a pop sequence of N numbers. All the numbers in a line are separated by a space.

Output Specification:

For each pop sequence, print in one line "YES" if it is indeed a possible pop sequence of the stack, or "NO" if not.

Sample Input:

5 7 5
1 2 3 4 5 6 7
3 2 1 7 5 6 4
7 6 5 4 3 2 1
5 6 4 3 7 2 1
1 7 6 5 4 3 2

Sample Output:

YES
NO
NO
YES
NO

using System;
using System.Collections.Generic;
using System.Text;

class T
{


    static void Main(string[] args)

    {
        var line = Console.ReadLine().Split(new[] { " " }, StringSplitOptions.RemoveEmptyEntries);
        var maxNum = int.Parse(line[0]);
        var lineNum = int.Parse(line[1]);
        var lineCount = int.Parse(line[2]);

        List<string> list = new List<string>();

        for (int i = 0; i < lineCount; i++)
        {
            list.Add(Console.ReadLine());
        }

        foreach (var item in list)
        {
           
            string Y = "YES";
            var numss = item.Split(new[] { " " }, StringSplitOptions.RemoveEmptyEntries);

            List<int> nums = new List<int>();
            foreach (var item2 in numss)
            {
                nums.Add(int.Parse(item2));
            }


            for (int i = 0; i < nums.Count; i++)
            {  if (i > 0)
                {
                    if (nums[i - 1] - nums[i] > 1)
                    {

                        Y = "NO";
                        break;
                    }
                }

                if (nums[i] > maxNum   )
                {
                    Y = "NO";
                    break;
                }
                else
                {
                    for (int j = i + 1; j < nums.Count; j++)
                    {
                        if (nums[i] < nums[j])
                        {
                            nums[j]--;
                        }
                    }
                     
                }
              


            }




            Console.WriteLine(Y);
        }

    }

}