[백준] 랜선 자르기 1654 - JAVA

문제

https://www.acmicpc.net/problem/1654

1654번: 랜선 자르기

 

풀이

import java.io.*;
import java.util.*;

class Main{	
	static int k, n;
	static int arr[];
	public static void main(String[] args) throws Exception {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		StringTokenizer st = new StringTokenizer(br.readLine());
		
		k = Integer.parseInt(st.nextToken());
		n = Integer.parseInt(st.nextToken());
		
		arr = new int[k];
		
		for(int i=0;i<k;i++) {
			arr[i] = Integer.parseInt(br.readLine());
		}
		
		long l = 1;
		long r = Integer.MAX_VALUE;
		
		while(l<r) {
			long mid = (l+r+1)/2;
			if(solve(mid) < n) {
				r = mid-1;
			}
			else {
				l = mid;
			}
		}
		
		System.out.print(l);
		
	}
	
	static long solve(long val) {
		long cnt = 0;
		for(int i=0;i<k;i++) {
			cnt += arr[i] / val;
		}
		return cnt;
	}
	
}