leetcode LargestNumber
z
 2019-04-09 10:36:27   
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import java.util.Comparator;

import static java.util.Arrays.sort;

public class LargestNumber {
  /*
  Given a list of non negative integers, arrange them such that they form the largest number.

  Example 1:

  Input: [10,2]
  Output: "210"
  Example 2:

  Input: [3,30,34,5,9]
  Output: "9534330"
  Note: The result may be very large, so you need to return a string instead of an integer.*/
  public static String largestNumber(int[] nums) {
    int n = nums.length;
    String[] s = new String[n];
    for (int i=0; i<n; i++){
      s[i] = String.valueOf(nums[i]);
    }
    Comparator<String> c = new Comparator<String>() {
      @Override
      public int compare(String o1, String o2) {
        return (o2+o1).compareTo(o1+o2);
      }
    };
    sort(s, c);
    String result = String.join("", s);
    return result;
  }

  public static void main(String[] args){
    int[] test = new int[]{3,30,34,5,9};
    System.out.println(largestNumber(test));
  }
}