#include <iostream>
#include <stdlib.h>
using namespace std;
int main() {
int n;
cin >> n;
int array[n];
for ( int i = 0; i < n; i++)
{
cin >> array[i];
}
int max = 999999999;
for ( int i = 1; i < n; i++)
{
if (abs(array[i-1]-array[i])<max) max = array[i-1]-array[i];
}
cout << max;
return 0;
}
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