B. Fence1100 / 前缀和

Posted 2021-11-11 幽殇默

https://codeforces.com/problemset/problem/363/B

#include<bits/stdc++.h>
using namespace std;
const int N=1e5*2+10;
int a[N],s[N],n,k,ans=1e9,flag;
int main(void)
{
	cin>>n>>k;
	for(int i=1;i<=n;i++) cin>>a[i];
	for(int i=1;i<=n;i++) s[i]=s[i-1]+a[i];
	for(int i=1;i+k-1<=n;i++)
	{
		int temp=s[i+k-1]-s[i-1];
		if(temp<ans)
		{
			ans=temp;
			flag=i;
		}
	}
	cout<<flag<<endl;
	return 0;
}