delete pics to save space

2.1442.cpp

@@ -0,0 +1,47 @@
+#include<cstdio>
+#include<algorithm>
+using namespace std;
+const int maxn=1000000+5;
+int n;
+int up[maxn],down[maxn];
+int h1[maxn],h2[maxn];
+int solve()
+{
+	int level,res=0;
+	h1[0]=level=up[0];
+	for(int i=1;i<n;i++)
+	{
+//		int nowup=up[i],nowdown=down[i];
+		if(down[i]>level) level=down[i];
+		if(up[i]<level) level=up[i];
+		h1[i]=level;
+	}
+	h2[n-1]=level=up[n-1];
+	for(int i=n-2;i>=0;i--)
+	{
+//		int nowup=up[i],nowdown=down[i];
+		if(down[i]>level) level=down[i];
+		if(up[i]<level) level=up[i];
+		h2[i]=level;
+	}
+	for(int i=0;i<n;i++)
+		res+=min(h1[i],h2[i])-down[i];
+	return res;
+}
+int main()
+{
+	
+#ifdef local
+	freopen("pro.in","r",stdin);
+#endif
+	int T;
+	scanf("%d",&T);
+	while(T-->0)
+	{
+		scanf("%d",&n);
+		for(int i=0;i<n;i++) scanf("%d",down+i);
+		for(int i=0;i<n;i++) scanf("%d",up+i);
+		printf("%d\n",solve());
+	}
+	return 0;
+}