如果不是engineer方向，就data scientist的话，一般不考算法。但是长远来看，刷刷算法对data scientist有好...
Should we even treat missing values is another important point to consider? If 80% of the values for a variable are missing then you may drop the variable instead of treating the missing values. Deleting the observation...
Should we even treat missing values is another important point to consider? If 80% of the values for a variable are missing then you may drop the variable instead of treating the missing values. Deleting the observations: when your have sufficient data points and your delete will not introduce...
If we don’t rotate the components, the effect of PCA will diminish and we’ll have to select more number of components to explain variance in the data set. BA Interview Question & Answer Write a query in SQL to count the number of available rooms for each block in each floor. Answer:...
Suppose every senator is smart enough and will play the best strategy for his own party, you need to predict which party will finally announce the victory and make the change in the Dota2 game. The output should be Radiant or Dire. Example 1: Input: "RD" Output: "Radiant" Explanation:...
| 2 | Science | fiction | 8.5 | | 3 | irish | boring | 6.2 | | 4 | Ice song | Fantacy | 8.6 | | 5 | House card| Interesting| 9.1 | +---+---+---+---+ 查找id 为奇数,并且 description 不是 boring 的电影,按 rating 降序。 +---+---+---+---+ | id | movie |...
在进行大批量的字符串反转,倘若我使用之前学过的双指针或for循环的方式,前者直接修改了原始数据,后者需要确定字符串的原始规模,循环代价特别大。 HelloWorld NiHaoNeking 一次处理10个字符:先对10个字符内部进行倒叙,再用Stack进行弹出 dlroWolleH gnikeNoaHiN ...
AddressId is the primary key column for this table. 查找FirstName, LastName, City, State 数据,而不管一个用户有没有填地址信息。 Solution 涉及到 Person 和 Address 两个表,在对这两个表执行连接操作时,因为要保留 Person 表中的信息,即使在 Address 表中没有关联的信息也要保留。此时可以用左外连接...
These rules were not invented by Leetcode; they have been commonly used in computer science contests for quite a long time. Datasets As in the previous benchmark, I wanted to run LLMs on two sets of problems: "well-known" problems are not only published long ago but are also most often...
Graphs and trees are important data structures in computer science used for modelling and analyzing complex relationships between objects. They find wide applications in various fields including algorithms, network modelling, databases, bioinformatics, and more. Key Characteristics of Graphs and Trees: Grap...