leetcode题目例题解析（十五）

leetcode题目例题解析（十五）

Sort Colors

题目描述：

Given an array with n objects colored red, white or blue, sort them so that objects of the same color are adjacent, with the colors in the order red, white and blue.
Here, we will use the integers 0, 1, and 2 to represent the color red, white, and blue respectively.
Note:
You are not suppose to use the library’s sort function for this problem.

题意解析：

简单的排序问题

解题思路：

由于元素只有三种所以我们这里用了简单选择排序

代码：

class Solution {
public:
    void exchange(int& a, int &b) {
        a^=b;
        b^=a;
        a^=b;
    }
    void sortColors(vector<int>& nums) {
        int s = nums.size();
        int min;
        for (int i = 0; i < s; i++) {
            min = i;
            for (int j = i + 1; j < s; j++) {
                 if (nums[min] > nums[j])
                     min = j;
            }
            if (min != i)
                exchange(nums[min], nums[i]);
        }
    }
};

原题目链接:
https://leetcode.com/problems/sort-colors/description/