delete pics to save space

7.1179.cpp

@@ -0,0 +1,45 @@
+#include<cstdio>
+#include<cstring>
+#include<algorithm>
+using namespace std;
+const int oo=0x3f3f3f3f;
+const int maxn=105;
+int n,a[maxn],op[maxn],f[2][maxn][maxn];
+int main()
+{
+	#ifdef local
+	freopen("pro.in","r",stdin);
+	#endif
+	scanf("%d",&n);
+	for(int i=1;i<=n;i++)
+	{
+		char s[2]; int x; scanf("%s%d",s,&x);
+		op[i-1]=(s[0]=='t'?0:1); a[i]=x;
+	}
+	for(int i=1;i<=n;i++) { a[n+i]=a[i]; op[n+i-1]=op[i-1]; }
+	for(int i=1;i<=n*2-1;i++) for(int j=i;j<=n*2-1;j++) { f[0][i][j]=-oo; f[1][i][j]=oo; }
+	for(int i=1;i<=n*2-1;i++) f[0][i][i]=f[1][i][i]=a[i];
+	for(int len=2;len<=n;len++)
+		for(int i=1;i+len-1<=n*2-1;i++)
+		{
+			int j=i+len-1;
+			for(int k=i;k<j;k++)
+			{
+				if(!op[k])
+				{
+					f[0][i][j]=max(f[0][i][j],f[0][i][k]+f[0][k+1][j]);
+					f[1][i][j]=min(f[1][i][j],f[1][i][k]+f[1][k+1][j]);
+				}
+				else
+				{
+					f[0][i][j]=max(f[0][i][j],max(f[0][i][k]*f[0][k+1][j],f[1][i][k]*f[1][k+1][j]));
+					f[1][i][j]=min(f[1][i][j],min(min(f[0][i][k]*f[0][k+1][j],f[1][i][k]*f[1][k+1][j]),min(f[0][i][k]*f[1][k+1][j],f[1][i][k]*f[0][k+1][j])));
+				}
+			}
+		}
+	int res=-oo;
+	for(int i=1;i<=n;i++) res=max(res,f[0][i][i+n-1]);
+	printf("%d\n",res);
+	for(int i=1;i<=n;i++) if(f[0][i][i+n-1]==res) printf("%d ",i); puts("");
+	return 0;
+}