출처
- 2025 Sogang Programming Contest Master A번
문제
풀이
#include <iostream>
#include <vector>
using namespace std;
bool solve(void) {
int n; cin >> n;
vector<bool> v(6, true);
while (n--) {
int x; cin >> x;
v[x] = false;
}
for (int i=1; i<=5; i++) {
if (v[i]) return true;
}
return false;
}
int main(void) {
ios::sync_with_stdio(false);
cin.tie(nullptr);
cout << (solve() ? "YES" : "NO");
return 0;
}