delete pics to save space

2.11181.cpp

@@ -0,0 +1,36 @@
+#include<cstdio>
+#include<cstring>
+int n,r,kase;
+bool buy[25];
+double p[25],s[25];;
+void dfs(int depth,int bought,double res)
+{
+	if(bought>r||depth-bought>n-r) return;
+	if(depth>=n)
+	{
+		s[n]+=res;
+		for(int i=0;i<n;i++)
+			if(buy[i]) s[i]+=res;
+		return;
+	}
+	buy[depth]=0;
+	dfs(depth+1,bought,res*(1-p[depth]));
+	buy[depth]=1;
+	dfs(depth+1,bought+1,res*p[depth]);
+}
+int main()
+{
+#ifdef local
+	freopen("pro.in","r",stdin);
+#endif
+	while(scanf("%d%d",&n,&r)==2&&n)
+	{
+		for(int i=0;i<n;i++) scanf("%lf",p+i);
+		memset(s,0,sizeof(s));
+		dfs(0,0,1.0);
+		printf("Case %d:\n",++kase);
+		for(int i=0;i<n;i++)
+			printf("%.6lf\n",s[i]/s[n]);
+	}
+	return 0;
+}