#include<iostream> // cin\cout\endl #include<cstdio> //scanf()\printf() #include<cstring> // strcpy()\strcat()\strcmp()\strlen()\memset() #include<cmath> //sqrt()\pow()\abs()\ceil()\floor()\max()\min() using namespace std; int main(){ int i,j,n,a[1001],min_a,i1=1,j1=2; cin>>n; i1=1; j1=2; for(int k=1;k<=n;k++){ cin>>a[k]; } min_a=abs(a[1]-a[2]); for(i=1;i<n;i++){ for(j=i+1;j<=n;j++){ if(min_a>abs(a[i]-a[j])){ min_a=abs(a[i]-a[j]); i1=i; j1=j; } } } cout<<i1<<" "<<j1; return 0; }