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- #include<stdio.h>
- void main()
- {
- int n,i,min,max,f;
- scanf("%d",&n);
- int a[n];
- for(i=0;i<n;i++)
- scanf("%d",&a[i]);
- min=a[0];
- for(i=0;i<n;i++)
- {
- if(a[i]<=min)
- min=a[i];
- if(a[i]>=max)
- max=a[i];
- }
- f=0;
- for(i=0;i<n;i++)
- {
- if(a[i]>=min && a[i]<=max)
- ;
- else
- f++;
- }
- if(f==0)
- printf("YES");
- else
- printf("NO");
- }
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