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- const int MAXN=111111;
- int a[MAXN],n;
- int main()
- {
- cin >> n;
- for (int i=0;i<n;i++) {
- cin >> a[i];
- }
- int ans=2;
- int cnt=2;
- for (int i=2;i<n;i++) {
- cnt++;
- if (a[i]!=a[i-1]+a[i-2]) cnt=2;
- ans=max(ans,cnt);
- }
- ans=min(ans,n);
- cout << ans;
- return 0;
- }
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