delete pics to save space

p.CH5E09.cpp

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+//https://www.acwing.com/problem/content/322/
+#include<cstdio>
+#include<algorithm>
+using namespace std;
+const int maxn=205;
+int n,a[maxn],dp[maxn][maxn];
+int main()
+{
+#ifdef local
+	freopen("pro.in","r",stdin);
+#endif
+	scanf("%d",&n);
+	for(int i=1;i<=n;i++)
+	{
+		scanf("%d",&a[i]);
+		a[i+n]=a[i];
+	}
+	int len=n;
+	n=2*n-1;
+	for(int len=2;len<=n;len++)
+		for(int i=1;i+len-1<=n;i++)
+		{
+			int l=i,r=i+len-1;
+			for(int j=l;j<r;j++)
+				dp[l][r]=max(dp[l][r],dp[l][j]+dp[j+1][r]+a[l]*a[j+1]*a[r+1]);
+		}
+	int res=0;
+	for(int i=1;i+len-1<=n;i++) res=max(res,dp[i][i+len-1]);
+	printf("%d\n",res);
+	return 0;
+}