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- #include <iostream>
- using namespace std;
- void f(int n, int a[100], int &k)
- {
- int i, p=1, impar=1;
- for(i=0; i<n ; i++)
- if(a[i]%2!=0)
- impar++;
- if(impar==n)
- k=-1;
- else
- {
- k=0;
- for(i=0; i<n; i++)
- {
- if(a[i]%2==0)
- {
- k=a[i]*p+k;
- p=p*10;
- }
- }
- }
- }
- int main()
- {
- int n, a[100], k, i;
- cin>>n;
- for(i=0; i<n; i++)
- cin>>a[i];
- f(n, a, k);
- cout<<k;
- return 0;
- }
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