#include<iostream>
#include<cstring>
#include<math.h>
#include<stdlib.h>
#include<cstring>
#include<cstdio>
#include<utility>
#include<algorithm>
#include<map>
#include<iomanip>
using namespace std;
long long int n,k;
const int maxn=100005;
const double inf=200005.0; 
double ary[maxn];

int div(double x){//每条长度为x可以分为几段 
	int ans=0;
	for(int i=1;i<=n;i++){
		ans+=(int)(ary[i]/x);
	}
	return ans>=k;
}


int main()
{	
	ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
	//freopen("input.txt","r",stdin); 
    while(cin>>n>>k){
    	for(int i=1;i<=n;i++)cin>>ary[i];
		
    	sort(ary+1,ary+1+n);
    	//这里left>0会错。。。 
    	double left=0,right=ary[n];
    	
    	double mid=0;
    	for(int i=1;i<=100;i++){
    		mid=(left+right)/2;
    		//分割段数过多说明木板长度小，所以这里是左端点 
    		if(div(mid))left=mid;
    		else right=mid;
    	}
    	printf("%.2f\n",floor(left*100)/100);
    	
    } 
    return 0;
}

• Re:为什么将初始左端点设置为1就WA呢 (1082) ygtxr1997 2020-05-05 11:08:39