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- #include <bits/stdc++.h>
- using namespace std;
- int n,i,st,dr,v[1001],d;
- int M(int st,int dr)
- {
- if(st==dr)
- {
- if(v[st]==1||v[st]==0) return 0;
- for(d=2;d*d<=v[st];d++)
- if(v[st]%d==0) return 0;
- return v[st];
- }
- else{
- int mij,max1,max2;
- mij=(st+dr)/2;
- max1=M(st,mij);
- max2=M(mij+1,dr);
- if(max1>max2) return max1;
- else return max2; } }
- int main()
- {
- int n;
- cin >> n;
- for(i=1;i<=n;i++) cin >> v[i];
- cout << M(1,n);
- }
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