#include<iostream> #include<cmath> using namespace std; int main(){ long long n,a[1145],minn,minn2,minn1,i,j; cin>>n; for(i=0;i<n;i++){ cin>>a[i]; }minn=abs(a[1]-a[0]); minn1=minn2=n-1; for(i=0;i<n;i++){ for(j=i+1;j<n;j++){ minn=min(minn,abs(a[i]-a[j])); if(minn==abs(a[i]-a[j])){ minn1=min(i,j); minn2=max(i,j); } } }cout<<minn1+1<<" "<<minn2+1; return 0; }