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- #include <iostream>
- #include <queue>
- using namespace std;
- int main(){
- int n;
- cin>>n;
- queue<int> q;
- int k5=0, k1=0;
- int ans=0;
- int a;
- for(int i=0;i<4;i++){
- cin>>a;
- q.push(a);
- }
- for(int i=4;i<n;i++){
- cin>>a;
- if(q.front()%5==0){
- k5++;
- }
- else{
- k1++;
- }
- if(a%5==0){
- ans+=k5+k1;
- }
- else{
- ans+=k5;
- }
- q.pop();
- q.push(a);
- }
- cout<<ans;
- }
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