还有就是求助题意，负数要输出吗？

#include<cstdio>
#include<algorithm>
#define inf 2147483647 
#define N 114514
using namespace std;
int n,k,s1[N],s2[N],ans=-inf;
signed main(){
	scanf("%d%d",&n,&k);
	for(int i=1;i<=n;i++){
		scanf("%d",&s2[i]);
		s1[i]=s1[i-1]+max(s2[i],0); 
		s2[i]+=s2[i-1];
	}
	for(int i=1;i+k<=n;i++){
		int j=i+k-1;
		ans=max(ans,s2[j]-s2[i-1]+s1[i-1]+s1[n]-s1[j]);
		ans=max(ans,s1[i-1]+s1[n]-s1[j]);
	}
	printf("%d",ans);
	return 0;
}