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- #include <stdio.h>
- int main()
- {
- int n[99],N,i,flag=0;
- scanf("%d",&N);
- for(i=0;i<N;i++)
- scanf("%d",&n[i]);
- for(i=1;i<N-1;i++)
- if((n[i]<n[i-1]&&n[i]<n[i+1]) || (n[i]>n[i-1]&&n[i]>n[i+1]))
- continue;
- else flag=1;
- if(flag==0)
- printf("DA");
- else printf("NE");
- }
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