#include<bits/stdc++.h>
using namespace std;
int main()
{
    int n;
    cin >> n;
    int a = n % 10;
    int b = n / 10 % 10;
    int c = n / 100;
    cout << max(c,max(a , b)) - min(c , min(a , b));
    return 0;
}

#include <bits/stdc++.h>
using namespace std;
int main()
{
    int n, min = 999999, max = 0;
    cin >> n;
    while (n > 0)
    {
        if (n % 10 < min)
        {
            min = n % 10;
        }
        if (n % 10 > max)
        {
            max = n % 10;
        }
        n /= 10;
    }
    cout << max - min;
    return 0;
}

#include<bits/stdc++.h>
using namespace std;
int main()
{
    int x;
    cin>>x;
    cout<<max(max(x/100,x/10%10),x%10)-min(min(x/100,x/10%10),x%10);
    return 0;
}

用字符串写一个

#include<bits/stdc++.h>
using namespace std;
string s;
int a[15];
int main()
{
    cin>>s;
    for(int i=0;i<3;i++)
    {
        a[i]=s[i];
    }
    sort(a,a+3);
    cout<<a[2]-a[0];
    return 0;
}

#include<bits/stdc++.h>
using namespace std;
int main()
{
    int c,v,n,s;
    cin >> s;
    c = s % 10;
    v = s / 10 % 10;
    n = s /100;
    int a = max(c,max(v,n));
    int b = min(c,max(v,n));
    cout <<a - b;
    return 0;
}//A