Water…
#include <iostream>
#include <cmath>
using namespace std;
int main()
{
int n;
scanf("%d",&n);
int now;
scanf("%d",&now);
int ans = -1;
for(int i=1;i<n;i++)
{
int x;
scanf("%d",&x);
if(abs(x-now) > ans)
ans = abs(x-now);
now = x;
}
cout<<ans;
return 0;
}