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- #include<bits/stdc++.h>
- #define ll long long
- #define N 100000007
- using namespace std;
- int main()
- {
- int n;
- cin>>n;
- int arr[N];
- int flag=2,temp=2;
- for(int i=0;i<n;i++){
- cin>>arr[i];
- }
- for(int i=2;i<n;i++){
- if(arr[i]==arr[i-1]+arr[i-20]){
- flag++;
- }
- else{
- flag=2;
- }
- temp=max(flag,temp);
- }
- if(n<=2){
- cout<<n<<endl;
- }
- else{
- cout<<temp<<endl;
- }
- return 0;
- }
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