뮤직비디오(결정알고리즘)

 

import java.util.Arrays;
import java.util.Scanner;

public class Main {
	
	public int count(int[] arr, int capacity) {
		int cnt = 1;
		int sum = 0;
		
		for(int x : arr) {
			if(sum+x > capacity) {
				cnt++;
				sum = x;
			}
			else {
				sum += x;
			}
		}
		
		return cnt;
	}

	public int solution(int n, int cd, int[] arr) {
		int ans = 0;
		
		int lt = Arrays.stream(arr).max().getAsInt();
		int rt = Arrays.stream(arr).sum();
		
		while(lt <= rt) {
			int mid = (lt + rt) / 2;
			
			if(count(arr, mid) <= cd) {
				ans = mid;
				rt = mid-1;
			}
			else {
				lt = mid+1;
			}
		}
		
		return ans;
	}
	
	public static void main(String[] args) {
		Main T = new Main();
		Scanner kb = new Scanner(System.in);
		
		int n = kb.nextInt();
		int cd = kb.nextInt();
		int[] arr = new int[n];
		for(int i = 0; i < n; i++) {
			arr[i] = kb.nextInt();
		}
		System.out.println(T.solution(n, cd, arr));
	}

}