A7831.小码君的随机数

NOIP普及组原题

#include <cstdio>
#include <array>
#include <algorithm>

int N;
std::array<int, 100> a;

int main() {
    scanf("%d", &N);
    for (int i=1; i<=N; i++) 
        scanf("%d", &a[i]);
    std::sort(a.begin(), a.end());
    int M = std::unique(a.begin(), a.end()) - a.begin() - 1;
    printf("%d\n", M);
    for (int i=1; i<=M; i++) 
        printf("%d ", a[i]);
    return 0;
}