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- #include <iostream>
- #include <vector>
- using namespace std;
- int main(){
- vector<int> nym(27, 0);
- vector<int> sym(27, 0);
- int n;
- cin>>n;
- for(int i=0;i<n;i++){
- int a;
- cin>>a;
- nym[a%27]++;
- sym[a%27]+=a;
- }
- int ans1=0;
- int ans2=0;
- for(int i=0;i<27;i++){
- for(int j=0;j<27;j++){
- if((i+j)%27==13){
- if(i==j && nym[i]>0){
- ans1+=sym[i]*(nym[i]-1);
- }
- else{
- if(nym[i]>0 && nym[j]>0){
- ans2+=(sym[i]+sym[j])*nym[j];
- }
- }
- }
- }
- }
- cout<<ans1+ans2/2;
- }
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