An array is defined to be minmax-disjoint if the following conditions hold

1.美国面试题：

An array is defined to be minmax-disjoint if the following conditions hold:
a. The minimum and maximum values of the array are not equal.
b. The minimum and maximum values of the array are not adjacent to one another.
c. The minimum value occurs exactly once in the array.
d. The maximum value occurs exactly once in the array.
For example the array {5, 4, 1, 3, 2} is minmax-disjoint because
a. The maximum value is 5 and the minimum value is 1 and they are not equal.
b. 5 and 1 are not adjacent to one another
c. 5 occurs exactly once in the array
d. 2 occurs exactly once in the array
Write a function named isMinMaxDisjoint that returns 1 if its array argument is minmax-disjoint, otherwise it returns 0.
If you are programming in Java or C#, the function signature is
int isMinMaxDisjoint(int[ ] a)
If you are programming in C or C#, the function signature is
int isMinMaxDisjoint(int a[ ], int len) where len is the number of elements in the array.

2.测试样例

3. java代码实现

public class minmaxdisjoint {
    public static void main(String[] args) {
//        int []a={18, -1, 3, 4, 0};
//        int []a={9, 0, 5, 9};
//        int []a={0, 5, 18, 0, 9};
//        int []a={7, 7, 7, 7};
//        int []a={1, 2};
//        int []a={};
//        int []a={1};
        int []a={5, 4, 1, 3, 2};
        System.out.println(isMinMaxDisjoint(a));

    }

    public static int isMinMaxDisjoint(int []a){

        if(a.length>1) {

            int max = a[0];
            int min = a[0];

            for(int i = 0; i < a.length; i++){

                if(a[i]>max){
                    max = a[i];
                }
                if(a[i]<min){
                    min= a[i];
                }
            }

//            if(Math.abs(max)-Math.abs(min)==1){
//                return 0;
//            }
            if(max==min){
                return 0;
            }


            int countmax=0;
            int countmin=0;
            int x=0;
            int y=0;
            for (int j = 0; j < a.length  ; j++) {

                if(a[j]==max){
                    x = j;
                    countmax++;
                    if(countmax>1){
                        return 0;
                    }


                }
                if(a[j]==min){
                    y=j;
                    countmin++;
                    if(countmin>1){
                        return 0;
                    }
                }
            }
            if(Math.abs(x-y)==1){
                return 0;

            }

            return 1;

        }else {return 0;}

    }
}