二分——木材加工

原文链接：https://www.luogu.com.cn/problem/P2440

AC代码：

#include
#include
#include
#include
using namespace std;
#define ll long long
ll n,k,lef=0,rig=0,ans=0;
vector<ll> vec;
ll judge(ll now){
	ll i,j,tim=0;
	for(i=0;i<vec.size();i++){
		tim+=vec[i]/now;
	}
	return tim>=k;
}
int main(){
	ll i,j;
	cin>>n>>k;
	for(i=0;i<n;i++){
		cin>>j;
		vec.push_back(j);
		lef=lef>j?j:lef;
		rig=rig>j?rig:j; 
	}
	while(lef<=rig&&rig!=0){
		ll mid=(lef+rig)/2;
		//cout<
		int flag=judge(mid);
		if(flag){
			ans=mid;lef=mid+1;
		}
		else{
			rig=mid-1;
		}
	}
	cout<<ans<<endl;
	return 0;
}