Leetcode-June-Challenge/sort colors.cpp at master · Anirudhk07/Leetcode-June-Challenge · GitHub

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quicksort - inplace

class Solution {
public:
    void sortColors(vector<int>& nums) {
       if(nums.size()==1 ||nums.size()== 0)
           return;
        int start = 0;
        int end = nums.size()-1;
        int index = 0 ;
        while(start<end && index<=end)
        {

            if(nums[index]== 0)
            {

                nums[index] = nums[start];
                nums[start] = 0;
                start++;
                index++;
            }
            else if(nums[index]==2)
            {
                nums[index] = nums[end];
                nums[end] = 2;
                end--;

            }
            else{
                index++;

            }
        }
    }
};