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- #include <iostream>
- using namespace std;
- int main(){
- int n;
- cin>>n;
- int k9C=0, k3C=0, k1C=0;
- int k9N=0, k3N=0, k1N=0;
- for(int i=0;i<n;i++){
- int a;
- cin>>a;
- if(a%9==0){
- if(a%2==0){
- k9C++;
- }
- else{
- k9N++;
- }
- }
- else if(a%3==0){
- if(a%2==0){
- k3C++;
- }
- else{
- k3N++;
- }
- }
- else{
- if(a%2==0){
- k1C++;
- }
- else{
- k1N++;
- }
- }
- }
- int ans=0;
- ans+=k9C*(k9N+k3C+k3N+k1C+k1N)+(k9C-1)*k9C/2;
- ans+=k9N*(k3C+k3N+k1C+k1N)+(k9N-1)*k9N/2;
- ans+=k3C*(k3N+k1C+k1N)+(k3C-1)*k3C/2;
- ans+=k3N*(k1C)+(k3N-1)*k3N/2;
- ans+=k1C*(k1N)+(k3C-1)*k3C/2;
- cout<<ans;
- }
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