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Write a function to find the longest common prefix in a string array.

If no common prefix exists, an empty string "" is returned.

Example 1:

Enter: ["flower", "flow", "flight"]

Output: "fl"

Example 2:

Enter: ["dog", "racecar", "car"]

Output: "

Explanation: the input does not have a common prefix.

Description:

All inputs contain only the lowercase letter amurz.

Parsing:

First of all, we have to understand why the above should be subtracted. For example, CM means 900. if it doesn't, then the following for loop will add 100,100 when it is executed to C and 1000 when it is executed to M, for a total of 1100. In fact, CM means 900. it has to be subtracted from 200. the same is true for others.

What are the advantages of Java. Simple, as long as understand the basic concepts, you can write applications suitable for a variety of situations; 2. Object oriented; 3. Distributed, Java is a network-oriented language; 4. Robust, java provides automatic garbage collection for memory management to prevent programmers from making mistakes when managing memory. ; 5. Security, Java used in the network and distributed environment must prevent the invasion of viruses. 6. Architecturally neutral, as long as the Java runtime system is installed, it can run on any processor. 7. Portability, Java can be easily ported to different machines on the network. 8. Interpretation execution, Java interpreter directly interprets and executes Java bytecode.

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