leetcode 75: Sort Colors

class Solution {public:    void sortColors(vector<int>& nums) {        int i=-1,j=-1,k=-1;        for(int m=0;m<nums.size();m++)        {            if(nums[m]==0)            {                nums[++k]=2;                nums[++j]=1;                nums[++i]=0;            }            else if(nums[m]==1)            {                nums[++k]=2;                nums[++j]=1;            }            else                nums[++k]=2;        }    }};