leetcode[2-]
2. Add Two Numbers
解題思路還是比較簡單的，只是要註意向高位進位。
比較優的解法借鑒思路是將所有可能的情況放入while中，用或運算進行判斷，進而少掉了很多冗余的寫法。while(l1 || l2 || carry);
leetcode[2-]
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