19在快速排序算法中,元素个数为n,一次划分的比较次数是( )\n \n \n \n \n \n \n

\n \n \n \n A.\n n-1次\n

\n \n

\n \n \n \n B.\n n次\n

\n \n

\n \n \n \n C.\n n+1次\n

\n \n

\n \n \n \n D.\n n+2次\n