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Java实现 LeetCode 912 排序数组(用数组去代替排序O(N))

912. 排序数组

给你一个整数数组 nums,将该数组升序排列。

示例 1:

输入:nums = [5,2,3,1]
输出:[1,2,3,5]
示例 2:

输入:nums = [5,1,1,2,0,0]
输出:[0,0,1,1,2,5]

提示:

1 <= nums.length <= 50000
-50000 <= nums[i] <= 50000

PS:
还记得当时这个排序,看的我一脸蒙蔽,为啥会这么快

class Solution {
     public int[] sortArray(int[] nums) {
        int max = -50001, min = 50001;
        for (int num: nums) {
            max = Math.max(num, max);
            min = Math.min(num, min);
        }


        int[] counter = new int[max - min + 1];
        for (int num: nums) {
            counter[num - min]++;
        }

        int idx = 0;
        for (int num = min; num <= max; num++) {
            int cnt = counter[num - min];
            while (cnt-- > 0) {
                nums[idx++] = num;
            }
        }
        return nums;
    }
}

posted on 2020-03-31 12:00  MarcusV  阅读(92)  评论(0编辑  收藏  举报