#include <iostream>
#include<bits/stdc++.h>
using namespace std;
int main() {
// your code goes here
int n;
cin>>n;
int arr[n];
for(int i=0; i<n; i++){
cin>>arr[i];
}
int d=abs(arr[0]-arr[n-1]);
int i,x=1,y=n;
for(i=0; i<n-1;i++){
if(d>abs(arr[i]-arr[i+1])){
d=abs(arr[i]-arr[i+1]);
x=i+1;
y=i+2;
}
}
cout<<x<<" "<<y<<endl;
return 0;
}
I2luY2x1ZGUgPGlvc3RyZWFtPgojaW5jbHVkZTxiaXRzL3N0ZGMrKy5oPgp1c2luZyBuYW1lc3BhY2Ugc3RkOwoKaW50IG1haW4oKSB7CgkvLyB5b3VyIGNvZGUgZ29lcyBoZXJlCglpbnQgbjsKCWNpbj4+bjsKCQoJaW50IGFycltuXTsKCWZvcihpbnQgaT0wOyBpPG47IGkrKyl7CgkJY2luPj5hcnJbaV07Cgl9CglpbnQgZD1hYnMoYXJyWzBdLWFycltuLTFdKTsKCWludCBpLHg9MSx5PW47Cglmb3IoaT0wOyBpPG4tMTtpKyspewoJCWlmKGQ+YWJzKGFycltpXS1hcnJbaSsxXSkpewoJCQlkPWFicyhhcnJbaV0tYXJyW2krMV0pOwoJCQl4PWkrMTsKCQkJeT1pKzI7CgkJfQoJfQoJY291dDw8eDw8IiAiPDx5PDxlbmRsOwoJcmV0dXJuIDA7Cn0=