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- #include <bits/stdc++.h>
- #define N 1005
- using namespace std;
- int main()
- {
- int v[N], n, i, a, b;
- bool apartin=1;
- cin >> n;
- for(i=1;i<=n;++i)
- cin >> v[i];
- a=v[1]; b=v[n];
- if(a>b) swap(a, b);
- for(i=2;i<n&&apartin;++i)
- if(a>v[i]||v[i]>b) apartin=0;
- if(apartin) cout << "DA";
- else cout << "NU";
- return 0;
- }
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