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    Re:為何海倫公式不行？樣例能過，也帶了兩個凹多邊形也是對的，所以錯在哪里了？或者求人給反例數據，謝謝
    Posted by 17540220 at 2018-03-06 20:43:44 on Problem 2036
    (119)   

    為何我復制你的代碼過來，輸出都是-1.$



輸入 3 0 0 3 0 0 4 返回就是-1.$了


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