delete pics to save space

7.2018.cpp

@@ -0,0 +1,31 @@
+#include<cstdio>
+#include<algorithm>
+using namespace std;
+const int maxn=100005;
+const double eps=1e-5;
+double a[maxn],b[maxn],s[maxn];
+int n,L;
+int main()
+{
+#ifdef local
+	freopen("pro.in","r",stdin);
+#endif
+	scanf("%d%d",&n,&L);
+	for(int i=1;i<=n;i++) scanf("%lf",&a[i]);
+	double l=-1e6,r=1e6;
+	while(r-l>eps)
+	{
+		double m=(l+r)/2,res=-1e10,mv=1e0;
+		for(int i=1;i<=n;i++) b[i]=a[i]-m;
+		for(int i=1;i<=n;i++) s[i]=b[i]+s[i-1];
+		for(int i=L;i<=n;i++)
+		{
+			mv=min(mv,s[i-L]);
+			res=max(res,s[i]-mv);
+		}
+		if(res>=0) l=m;
+		else r=m;
+	}
+	printf("%d\n",int(r*1000));
+	return 0;
+}