#include using namespace std; typedef long long ll; #define rep(i, n) for(int i = 0; i < (n); i++) #define rep1(i, n) for(int i = 1; i <= (n); i++) #define co(x) cout << (x) << "\n" #define cosp(x) cout << (x) << " " #define ce(x) cerr << (x) << "\n" #define cesp(x) cerr << (x) << " " #define pb push_back #define mp make_pair #define Would #define you #define please int main() { cin.tie(0); ios::sync_with_stdio(false); int N; cin >> N; map MP; rep(i, N) { int a; cin >> a; MP[a]++; } int kotae = 0; for (auto p : MP) { if (p.second == 1) kotae++; } co(kotae); Would you please return 0; }