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IP屬地：德克薩斯州
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2019-09
9-1 number-of-islands (medium)必須是vertical或者h(yuǎn)orizontal的“1”才是連成一個島，這里用dfs進(jìn)...
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前端知識Hoista variable can be used before it has been declared(var的定義方式).var沒有b...
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2019-06
6.5 fibonacci-number (easy)最基礎(chǔ)的算斐波那契數(shù)列。遞歸可以络它，或者是最簡單的動態(tài)規(guī)劃。這里的優(yōu)化就是空間復(fù)雜度從O(n...
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2019-05
5.6 symmetric-tree (easy)看一個樹是否鏡面對稱硬鞍，第一直覺是bfs，但還是用的遞歸和stack或者dequeue戴已，也就是說...
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2019-04
4.11.leaf-similar-trees (easy)所謂的leaf similar就是說固该，二叉樹的末端的node，從左到右的序列是一樣的...
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2019-03
3.11 two-sum (easy)Q: Given exactly one solution, -> 1 there still can b...