#include<bits/stdc++.h>
using namespace std;
int a[10001];
int main() {
int n, cnt = 1;
cin >> n;
for (int i = 1; i <= n; i++) {
cin >> a[i];
}
sort(a + 1, a + 1 + n);
for (int i = 2; i <= n; i++) {
if (a[i - 1] != a[i]) {
cnt++;
}
}
cout << cnt;
return 0;
}
各位大神，为啥我RE了？
