C++ 快排-随机中轴

Posted 2022-11-03 fulianzhou

    void QuickSort(vector<int> &nums, int left, int right)
    
        if (left >= right)
        
            return;
        

        int l = left;
        int r = right;
        
        int pos = rand() % (r - l) + l;
        int pivot = nums[pos];
        nums[pos] = nums[l];
        nums[l] = pivot;

        while (l < r)
        
            while (nums[r] >= pivot && l < r) r--;
            nums[l] = nums[r];

            while (nums[l] <= pivot && l < r) l++;
            nums[r] = nums[l];
        

        nums[l] = pivot;

        QuickSort(nums, left, l - 1);
        QuickSort(nums, r + 1, right);