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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.
Java代码：class StringComparator implements Comparator{ public int compare(String a, String b) { if (a.length() == b.length()) { return b.compareTo(a); } else { String ab = a + b; String ba = b + a; return ba.compareTo(ab); } }}public class Solution { public String largestNumber(int[] num) { StringBuffer sbuf = new StringBuffer(); ArrayList numstrings = new ArrayList (num.length); for (int i : num) numstrings.add(String.valueOf(i)); Collections.sort(numstrings, new StringComparator()); for (String s : numstrings) sbuf.append(s); String res = sbuf.toString(); if (res.length() > 0 && res.charAt(0) == '0') return "0"; return res; }}
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