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- #include <iostream>
- using namespace std;
- int main()
- {
- int F[11]={0},n;
- long long c=0;
- cin>>n;
- for(int i=1;i<=n;i++)
- {
- int x,nc=0;
- cin>>x;
- if(x==0) nc=1;
- while(x>0)
- {
- nc++;
- x=x/10;
- }
- F[nc]++;
- }
- for(int i=1;i<=10;i++)
- c=c+1LL*F[i]*(F[i]-1)/2;
- cout<<c;
- return 0;
- }
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