#include<bits/stdc++.h>
using namespace std;
int main()
{
    int a, b, c;
    cin >> a >> b >> c;
    if (a <= b && a <= c)
    {
        cout << a << " ";
        if (b <= c)
            cout << b << " " << c;
        else
            cout << c << " " << b;
    }
    if (b < a && b < c)
    {
        cout << b << " ";
        if (a <= c)
            cout << a << " " << c;
        else
            cout << c << " " << a;
    }
    if (c < a && c < b)
    {
        cout << c << " ";
        if (a <= b)
            cout << a << " " << b;
        else
            cout << b << " " << a;
    }
    return 0;
}

当输入3 2 2时，得到的结果应该是2 2 3

但是这个代码得到的结果为空

然而这个不正确的代码AC了，于是有了这条帖子