#include <iostream>
using namespace std;
int min_index(int arr[], int N)
{
int k,l,MIN;
l=1;
MIN=arr[l];
for(k=2;k<=N;k++)
{
if(MIN>arr[k])
{
MIN=arr[k];
l=k;
}
}
return l;
}
int main()
{
int N,k,i,j,L,R,MIN,pos=0;
cin>>N>>k;
int A[N],B[N-k+1];
long long S[N],Sum=0;
for(i=1;i<=N;i++)
{
cin>>A[i];
Sum+=A[i];
S[i]=Sum;
}
for(j=1;j<=N-k+1;j++)
{
L=j,R=j+k-1;
if(L==1)
B[j]= S[R];
else
B[j]=S[R]-S[L-1];
}
cout<<min_index(B, N-k+1);
return 0;
}
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