delete pics to save space

2.580.cpp

@@ -0,0 +1,17 @@
+#include<cstdio>
+int f[40],g[40],n;
+int main()
+{
+#ifdef local
+	freopen("pro.in","r",stdin);
+#endif
+	g[0]=1;g[1]=2;g[2]=4;
+	for(n=3;n<=30;n++)
+	{
+		f[n]=1<<(n-3);
+		for(int i=2;i<=n-2;i++) f[n]+=g[i-2]<<n-i-2;
+		g[n]=(1<<n)-f[n];
+	}
+	while(scanf("%d",&n)==1&&n) printf("%d\n",f[n]);
+	return 0;
+}