HDU-2018.5.6河南多校连萌Problem A

た入场券 2022-05-25 04:17 80阅读 0赞

**Problem A**

**Problem Description**

It's time to prepare the problems for the 14th Zhejiang Provincial Collegiate Programming Contest! Almost all members of Zhejiang University programming contest problem setter team brainstorm and code day and night to catch the deadline, and empty bottles of *Marjar Cola* litter the floor almost everywhere!

To make matters worse, one of the team member fell ill just before the deadline. So you, a brilliant student, are found by the team leader Dai to help the team check the problems' arrangement.

Now you are given the difficulty score of all problems. Dai introduces you the rules of the arrangement:

1. The number of problems should lie between 10 and 13 (both inclusive).

2. The difficulty scores of the easiest problems (that is to say, the problems with the smallest difficulty scores) should be equal to 1.

3. At least two problems should have their difficulty scores equal to 1.

4. After sorting the problems by their difficulty scores in ascending order, the absolute value of the difference of the difficulty scores between two neighboring problems should be no larger than 2. BUT, if one of the two neighboring problems is the hardest problem, there is no limitation about the difference of the difficulty scores between them. The hardest problem is the problem with the largest difficulty score. It's guaranteed that there is exactly one hardest problem.

The team members have given you lots of possible arrangements. Please check whether these arrangements obey the rules or not.

Input

There are multiple test cases. The first line of the input is an integer *T* (1 ≤ *T* ≤ 104), indicating the number of test cases. Then *T* test cases follow.

The first line of each test case contains one integer *n* (1 ≤ *n* ≤ 100), indicating the number of problems.

The next line contains *n* integers *s*1, *s*2, ... , *sn* (-1000 ≤ *si* ≤ 1000), indicating the difficulty score of each problem.

We kindly remind you that this problem contains large I/O file, so it's recommended to use a faster I/O method. For example, you can use scanf/printf instead of cin/cout in C++.

Output

For each test case, output "Yes" (without the quotes) if the arrangement follows the rules, otherwise output "No" (without the quotes).

Sample Input

1 2 3 4 5 6 7 8 9

1 2 3 4 5 6 7 8 9 10

999 1 1 2 3 4 5 6 7 8 9

999 1 3 5 7 9 11 13 17 19 21

15 1 13 17 1 7 9 5 3 11

1 1 1 1 1 1 1 1 1 1 1 1 2

2 3 4 5 6 7 8 9 10 11

15 1 13 3 6 5 4 7 1 14

Sample Output

Yes

Hint

The first arrangement has 9 problems only, which violates the first rule.

Only one problem in the second and the fourth arrangement has a difficulty score of 1, which violates the third rule.

The easiest problem in the seventh arrangement is a problem with a difficulty score of 2, which violates the second rule.

After sorting the problems of the eighth arrangement by their difficulty scores in ascending order, we can get the sequence 1, 1, 3, 4, 5, 6, 7, 13, 14, 15. We can easily discover that |13 - 7| = 6 > 2. As the problem with a difficulty score of 13 is not the hardest problem (the hardest problem in this arrangement is the problem with a difficulty score of 15), it violates the fourth rule.

**题意描述：**

判断一组序列是否满足

1、序列长度为10--13；

2、序列中最小数的为0；

3、序列中最少还有两个1；

4、将序列排序后除了最后一个，其余任一元素与前一个元素差值不能超过2；

**解题思路：**

逐条判断，满足上一条件后在判断下一条件，不符合输出No。

程序代码：

#include<stdio.h>
    
    #include<math.h>
    
    int main()
    
    {
    
        int a[110],t,n,i,j,min,f;
    
        while(scanf("%d",&t)!=EOF)
    
        {
    
            while(t--)
    
            {
    
                scanf("%d",&n);
    
                for(i=1;i<=n;i++)
    
                    scanf("%d",&a[i]);
    
                f=0;
    
                if(n<10||n>13)//判断第一个条件
    
                    printf("No\n");
    
                else
    
                {
    
                     for(i=1;i<n;i++)//比较交换排序将序列排序
    
                        for(j=i+1;j<=n;j++)
    
                        {
    
                            if(a[i]>a[j])
    
                            {
    
                                min=a[i];
    
                                a[i]=a[j];
    
                                a[j]=min;
    
                             }
    
                        }
    
                     if(a[1]!=1||a[2]!=1)//判断第二条和第三条
    
                         printf("No\n");
    
                     else
    
                    {
    
                        for(i=3;i<=n-1;i++)
    
                            if(a[i]-a[i-1]>2)//第四条
    
                            {
    
                                f=1;
    
                                break;
    
                            }
    
                        if(f==1)
    
                            printf("No\n");
    
                        else
    
                            printf("Yes\n");
    
                    }
    
                 }
    
             }
    
        }
    
        return 0;
    
    }