二分 Monthly Expense

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import java.util.*;

public class Main{
	Scanner scan=new Scanner(System.in);
	int n,m ,L=0,R=0;
	int[] s=new int [100010];
	
	public Main() {
		super();
		input();
		js();
	}
	public void input() {
		n=scan.nextInt();
		m=scan.nextInt();
		for (int i = 0; i < n; i++) {
			s[i]=scan.nextInt();
			L=Math.max(L, s[i]);
			R+=s[i];        //出错地方 不要想当然
		}
	}
	public boolean judge(int mid) {
		int sum=0,j=0;
		for (int i = 0; i < n;i++) {
			if(sum+s[i]>mid) {
				j++;
				sum=s[i];
			}
			else {
				sum+=s[i];
			}
		}
		if(++j<=m) return true;
		else return false;
	}
	public void js() {
		
		while(L<R) {
			int mid=L+(R-L)/2;
			if(judge(mid))
				R=mid;
			else 
				L=mid+1;
		}
		System.out.println(R);
	}
	
	public static void main(String[] args) {
		new Main();
	}
}