直接模拟即可

#include<iostream>
#include<cmath>
#include<algorithm>
using namespace std;
int main(){
    int n,last;
    cin>>n;
    int res=-1;
    n--;
    cin>>last;
    while(n--){
        int x;
        cin>>x;
        res=max(res,abs(last-x));
        last=x;
    }
    cout<<res<<endl;
    return 0;
}