Compare Version Numbers

本文介绍了一种用于比较软件版本号的算法实现。通过将版本号字符串以'.'分割并转换为整数,逐位进行比较,可以判断出两个版本号之间的大小关系。此方法适用于非空且仅包含数字和'.'字符的版本号字符串。

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Compare two version numbers version1 and version2.
If version1 > version2 return 1, if version1 < version2 return -1, otherwise return 0.

You may assume that the version strings are non-empty and contain only digits and the . character.
The . character does not represent a decimal point and is used to separate number sequences.
For instance, 2.5 is not "two and a half" or "half way to version three", it is the fifth second-level revision of the second first-level revision.

Here is an example of version numbers ordering:

0.1 < 1.1 < 1.2 < 13.37

把字符串以'.'分割,把分割后字符串转化成整型,逐位比较即可

class Solution {
public:
    int compareVersion(string version1, string version2) {
        int val1;
        int val2;
        int index1 = 0;
        int index2 = 0;
        while(index1<version1.length() || index2<version2.length()){
            val1 = 0;
            while(index1<version1.length()){
                if(version1[index1] == '.'){
                    index1++;
                    break;
                }else{
                    val1 = val1*10 + (version1[index1] - '0');
                    index1++;
                }
            }
            
            val2 = 0;
            while(index2<version2.length()){
                if(version2[index2] == '.'){
                    index2++;
                    break;
                }else{
                    val2 = val2*10 + (version2[index2] - '0');
                    index2++;
                }
            }
            
            if(val1 < val2){
                return -1;
            }
            if(val1 > val2){
                return 1;
            }
        }
        return 0;
    }
};


### Goroutines and Channel Output Comparison In the context of concurrent programming using Go language, goroutines provide an efficient way to execute functions concurrently. By prefixing a function call with `go`, this operation runs asynchronously in a separate goroutine without blocking the main program flow[^1]. When comparing outputs related to channels (`ch1`), consider how data flows between different parts of a program through these communication primitives. Channels allow safe sharing of values across multiple goroutines. #### Example Demonstrating Concurrent Execution Using Goroutines Below demonstrates sending messages over channel `ch1`. One version uses direct synchronous calls while another employs asynchronous execution via goroutines: ```go package main import ( "fmt" ) func sendDirect(ch chan int) { for i := 0; i < 5; i++ { ch <- i * 2 // Send even numbers directly into ch1 synchronously } close(ch) } func sendAsync(ch chan int) { go func() { // Run as goroutine for i := 0; i < 5; i++ { ch <- i * 3 // Send multiples of three into ch1 asynchronously } close(ch) }() } func main() { fmt.Println("Synchronous:") directCh := make(chan int) sendDirect(directCh) for v := range directCh { fmt.Printf("%d ", v) } fmt.Println("\nAsynchronous:") asyncCh := make(chan int) sendAsync(asyncCh) for v := range asyncCh { fmt.Printf("%d ", v) } } ``` This code snippet shows two methods for populating `ch1`: one performs operations sequentially within the same thread, whereas the other leverages concurrency by launching tasks inside independent lightweight threads known as goroutines.
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