因为平时都把“” 当做Null对待，这里就犯浑了。 这题，要把Null特别mark一下为‘NULL’，而特别处理 “” empty string. Design an algorithm to encode a list of strings to a string. The encoded string is then sent over the ...

So, you want to get better at those tricky LeetCode Python problems, huh? It’s a common goal, especially if you’re aiming for tech jobs. Many people try to just grind through tons of problems, but ...