java分巧克力

简单二分

Java样例

import java.util.*;
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        int k = sc.nextInt();
        int[] h = new int[n];
        int[] w = new int[n];
        for(int i=0;i<n;i++) {
            h[i] = sc.nextInt();
            w[i] = sc.nextInt();
        }

        int l=1,r=(int) 1e5;
        while(l<r) {
            int mid = (l+r+1)/2;
            if(check(mid,h,w)>=k) l=mid;
            else r=mid-1;
        }
        System.out.println(r);
    }

    public static int check(int mid,int[] h,int[] w) {
        int res = 0;
        for(int i=0;i<h.length;i++) {
            res += (h[i]/mid)*(w[i]/mid);
        }
        return res;
    }
}