LeetCode 1359. Count All Valid Pickup and Delivery Options
每日題。數學解太噁心了，學不來。
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LeetCode 799. Champagne Tower
每日題。自昨天知道臭狗有心臟病，到現在還是很難過。
LeetCode 589. N-ary Tree Preorder Traversal
Study Plan - Programming Skills。
LeetCode 542. 01 Matrix
Study Plan - Graph Theory。
LeetCode 496. Next Greater Element I
Study Plan - Programming Skills。