笨拙的牛電腦 - Problem

#22575. 笨拙的牛電腦

Statistics

牛不熟悉數位技術，本想建二進制（基數2）的計算機（是 cowmpouter），卻建成-2進制！很高興，因為-2進制沒有符號位元。

-2進制由右到左位權1,-2,4,-8,16,-32，依此類推。從1計數為1,110,111,100,101,11010,11011,11000,11001等。負數也僅用1與0，無符號。從-1遞減為11,10,1101,1100,1111等。

把普通十進制整數轉成-2進制。

輸入格式

一整數，範圍-2,000,000,000..2,000,000,000。

輸出格式

輸入整數的-2進制表示，無前導零。0恰好寫0。

範例

輸入格式 1

-13

輸出格式 1

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