l16091019_update_5_practice.c #5
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直接計算版本
This reverts commit b6ca15e.
method1跟上個版本一樣直接計算，method2為上課所說的利用遞迴方式計算
M1是利用quick_sort_median求中位數，而M2是利用quick_sort_median1求中位數，差別在求n為偶數時，M1是在 function 裡從大於第n/2大的數中找第n/2+1大的數字，而M2則是直接在main裡面全部從x[0]到x[N-1]在重新跑過一遍找第n/2+1大的數字，但後來發現兩個會一樣快，是因為M2在前n/2項不會做更動，所以其實就跟M1在找第n/2+1大的數做的事情是一樣的，四分位數就直接利用 M1 去搜尋
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