delete pics to save space

history_source/挑战程序设计竞赛/3.1.2.cpp

@@ -0,0 +1,39 @@
+#include<cstdio>
+#include<algorithm>
+using namespace std;
+int n,k;
+double l[10005];
+void init()
+{
+	scanf("%d%d",&n,&k);
+	for(int i=0;i<n;i++) scanf("%lf",l+i);
+}
+bool c(double len)
+{
+	int cnt=0;
+	for(int i=0;i<n;i++)
+		cnt+=l[i]/len;
+	return (cnt>=k);
+}
+void solve()
+{
+	double l=0,r=100000,mid;
+	while(r-l>0.001)
+	{
+		mid=(l+r)/2;
+		if(c(mid)) l=mid;
+		else r=mid;
+	}
+	printf("%.2lf\n",l);
+}
+int main()
+{
+	init();
+	solve();
+	return 0;
+}
+/*
+4
+11
+8.02 7.43 4.57 5.39
+*/