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- #include<bits/stdc++.h>
- using namespace std;
- int main()
- {
- int n;
- cin>>n;
- int a[n+2];
- bool flag[111111];
- for(int i=0;i<n;i++){
- cin>>a[i];
- }
- int cunt=0;
- for(int i=0;i<n;i++){
- if(!flag[a[i]]){
- flag[a[i]]=1;
- cunt++;
- }
- }
- cout<<cunt<<endl;
- return 0;
- }
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