Description
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714. Best Time to Buy and Sell Stock with Transaction Fee
Medium
Description
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495. Teemo Attacking
Medium
Description
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Quasi-Newton's Method
牛顿法
牛顿法每次得带都需要求解复杂的 Hessian 矩阵的逆矩阵导致速度很慢甚至当海森矩阵奇异时可能导致数值计算失败或产生的数值不稳定，于是拟牛顿法 (Quasi-Newton’s Method)被提了出来，它使用正定矩阵来近似海森矩阵的逆。
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499. Word Count (Map Reduce)
Description
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430. Flatten a Multilevel Doubly Linked List
Medium
Description
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