Leetcode no. 179

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179. Largest Number

Given a list of non negative integers, arrange them such that they form the largest number.

For example, given [3, 30, 34, 5, 9], the largest formed number is 9534330.

Note: The result may be very large, so you need to return a string instead of an integer.

public class Solution {    public String largestNumber(int[] nums) {        String[] str= new String[nums.length];        for (int i = 0; i < nums.length; i++) {            str[i]= Integer.toString(nums[i]);        }        Arrays.sort(str, new LargestNumberComparator());        StringBuilder sb= new StringBuilder();        for (String s: str) {            sb.append(s);        }        String res= sb.toString();        int index=0;        while (index< res.length() && res.charAt(index)=='0') index++;        if (index== res.length()) return "0";        return res.substring(index);    }}class LargestNumberComparator implements Comparator<String>{    @Override    public int compare(String o1, String o2) {        return (o2+o1).compareTo(o1+o2);    }}

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