#include <iostream>
#include <vector>
#include <string>
using namespace std;
int main() {
    int n;
    cin >> n;
    vector<long long> v(n);
    for (long long& i : v) {
        long long el;
        cin >> el;
        i = el;
    }
    long long min = 2 * pow(10, 9) + 1;
    int min1 = 0, min2 = 0;
    for (int i = 0; i < v.size(); ++i) {
        for (int j = i + 1; j < v.size(); ++j) {
            if (abs(v[i] - v[j]) < min) {
                min = abs(v[i] - v[j]);
                min1 = i + 1;
                min2 = j + 1;
            }
        }
    }
    cout << min << endl << min1 << " " << min2 << endl;
    system("pause");
}