https://www.nowcoder.com/discuss/92989?type=2&order=3&pos=63&page=3

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#include <bits/stdc++.h>
using namespace std;

int main()
{
    int n, m, column, cnt[1005];
    memset(cnt, 0, sizeof(cnt));
    cin >> n >> m;
    for (int i = 0; i < m; i++) {
        cin >> column;
        cnt[column]++;
    }
    cout << *min_element(cnt + 1, cnt + n + 1) << endl;   // 列数从1开始 
    return 0;
}