codeforces 363B

#include<stdio.h>

#include<string.h>

#define inf 999999999

#define N 151000

int a[N],c[N];

int main() {

int n,k,i,j,min,p,t;

while(scanf("%d%d",&n,&k)!=EOF) {

min=inf;

memset(c,0,sizeof(c));

for(i=1;i<=n;i++) {

scanf("%d",&a[i]);

            c[i]=a[i]+c[i-1];

if(i>=k) {

p=i-k+1;

t=c[i]-c[p-1];

if(min>t) {

min=t;

j=p;

}

}

}

printf("%d\n",j);

}

return 0;

}