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