Bài 1:
#include <iostream>
using namespace std;
int n,a;
int check(int a) {
for (;a != 0;a /= 10)
if (a % 10 == 6 | a % 10 == 8)
return 1;
return 0;
}
int main() {
ios::sync_with_stdio(0);
cin.tie(0);cout.tie(0);
cin >> n;
for (int i = 0;i < n;i++) {
cin >> a;
if (check(a))
cout << a << ' ';
}
}
Bài 2:
#include <algorithm>
#include <iostream>
using namespace std;
int n, m;
int a[10000];
int f, cnt, k;
int main() {
cin >> n;
for (int i = 0;i < n;i++) {
cin >> a[i];
}
sort(a,a + n);
for (int i = 0;i < n;i++) {
if (a[i] == k) {
cnt++;
} else {
k = a[i];
cnt = 1;
}
if (cnt > f) {
f = cnt;
m = a[i];
}
}
cout << m;
}
