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## Re:为什么将初始左端点设置为1就WA呢

Posted by ygtxr1997 at 2020-05-05 11:08:39 on Problem 1064
In Reply To:为什么将初始左端点设置为1就WA呢 Posted by:1069890 at 2019-08-05 23:58:49
> #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;
> }

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