179:最大数
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LeetCode/src/main/java/leetcode/editor/cn/LargestNumber.java
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LeetCode/src/main/java/leetcode/editor/cn/LargestNumber.java
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//给定一组非负整数 nums,重新排列每个数的顺序(每个数不可拆分)使之组成一个最大的整数。
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//
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// 注意:输出结果可能非常大,所以你需要返回一个字符串而不是整数。
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//
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//
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//
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// 示例 1:
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//
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//
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//输入:nums = [10,2]
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//输出:"210"
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//
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// 示例 2:
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//
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//
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//输入:nums = [3,30,34,5,9]
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//输出:"9534330"
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//
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//
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// 示例 3:
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//
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//
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//输入:nums = [1]
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//输出:"1"
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//
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//
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// 示例 4:
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//
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//
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//输入:nums = [10]
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//输出:"10"
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//
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//
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//
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//
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// 提示:
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//
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//
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// 1 <= nums.length <= 100
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// 0 <= nums[i] <= 109
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//
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// Related Topics 排序
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// 👍 542 👎 0
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package leetcode.editor.cn;
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import java.util.Arrays;
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//179:最大数
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public class LargestNumber {
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public static void main(String[] args) {
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//测试代码
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Solution solution = new LargestNumber().new Solution();
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solution.largestNumber(new int[]{10, 2});
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}
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//力扣代码
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//leetcode submit region begin(Prohibit modification and deletion)
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class Solution {
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public String largestNumber(int[] nums) {
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int n = nums.length;
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// 转换成包装类型,以便传入 Comparator 对象(此处为 lambda 表达式)
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Integer[] numsArr = new Integer[n];
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for (int i = 0; i < n; i++) {
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numsArr[i] = nums[i];
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}
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Arrays.sort(numsArr, (x, y) -> {
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long sx = 10, sy = 10;
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while (sx <= x) {
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sx *= 10;
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}
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while (sy <= y) {
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sy *= 10;
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}
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return (int) (-sy * x - y + sx * y + x);
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});
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if (numsArr[0] == 0) {
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return "0";
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}
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StringBuilder ret = new StringBuilder();
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for (int num : numsArr) {
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ret.append(num);
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}
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return ret.toString();
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}
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}
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//leetcode submit region end(Prohibit modification and deletion)
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}
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LeetCode/src/main/java/leetcode/editor/cn/LargestNumber.md
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LeetCode/src/main/java/leetcode/editor/cn/LargestNumber.md
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<p>给定一组非负整数 <code>nums</code>,重新排列每个数的顺序(每个数不可拆分)使之组成一个最大的整数。</p>
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<p><strong>注意:</strong>输出结果可能非常大,所以你需要返回一个字符串而不是整数。</p>
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<p> </p>
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<p><strong>示例 1:</strong></p>
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<pre>
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<strong>输入<code>:</code></strong><code>nums = [10,2]</code>
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<strong>输出:</strong><code>"210"</code></pre>
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<p><strong>示例 2:</strong></p>
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<pre>
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<strong>输入<code>:</code></strong><code>nums = [3,30,34,5,9]</code>
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<strong>输出:</strong><code>"9534330"</code>
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</pre>
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<p><strong>示例 3:</strong></p>
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<pre>
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<strong>输入<code>:</code></strong>nums = [1]
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<strong>输出:</strong>"1"
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</pre>
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<p><strong>示例 4:</strong></p>
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<pre>
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<strong>输入<code>:</code></strong>nums = [10]
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<strong>输出:</strong>"10"
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</pre>
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<p> </p>
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<p><strong>提示:</strong></p>
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<ul>
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<li><code>1 <= nums.length <= 100</code></li>
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<li><code>0 <= nums[i] <= 10<sup>9</sup></code></li>
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</ul>
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<div><div>Related Topics</div><div><li>排序</li></div></div>\n<div><li>👍 542</li><li>👎 0</li></div>
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