2

userId_undefined

吴东润

倔强青铜

2023-07-30 20:30:19

发布于：广东

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#include<iostream>
#include<set>
using namespace std;
set<long long>st;
int main(){
    freopen("distinct.in","r",stdin);
	freopen("distinct.out","w",stdout);
	long long n,sum=0;
	cin>>n; 
	for(int i=1;i<=n;i++){
		int m;
		cin>>m;
		st.insert(m);
	}
	for(auto it:st){
		sum++;
	}
	cout<<sum;
	fclose(stdin);
    fclose(stdout);
	return 0;
}
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