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- #include <iostream>
- using namespace std;
- int main()
- {
- int an, sn, sn1, sn2, n;
- cin >> n;
- if (n==1)
- cin >> sn;
- if (n==2)
- cin >> sn >> sn;
- if (n>2)
- {
- cin >> sn2;
- cin >> sn1;
- for ( int i=3; i<=n; ++i)
- {
- cin >> an;
- if (sn1<sn2)
- {
- sn=an+sn1;
- }
- else
- {
- sn=an+sn2;
- }
- sn2=sn1;
- sn1=sn;
- }
- }
- cout << sn;
- return 0;
- }
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