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leetcode || 75、Sort Colors

來源：程序員人生發布時間：2015-04-27 08:36:44 閱讀次數：3288次

problem：

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.

click to show follow up.

Follow up:
A rather straight forward solution is a two-pass algorithm using counting sort.
First, iterate the array counting number of 0's, 1's, and 2's, then overwrite array with total number of 0's, then 1's and followed by 2's.

Could you come up with an one-pass algorithm using only constant space?

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Array Two Pointers Sort

題意：將由0、1、2組成的數組按升序排序，不能使用字典排序

thinking：

（1）最簡單的是使用計數法，計算0、1、2 的個數，最后再填充

（2）最優算法是快速排序的變形：1次遍歷完成排序

code：

class Solution { public: void sortColors(int A[], int n) { int i = 0; // 0 pointer int j = n - 1; // 1 pointer int k = n - 1; // 2 pointer while (i <= j) { if (A[i] == 2) { int t = A[k]; A[k] = A[i]; A[i] = t; k--; if (k < j) j = k; } else if (A[i] == 1) { int t = A[j]; A[j] = A[i]; A[i] = t; j--; } else i++; } } };

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leetcode || 75、Sort Colors