Compare Version Numbers

本文介绍了一种用于比较软件版本号的算法实现。该算法通过解析两个版本号字符串,并逐位比较其数字部分来确定版本之间的大小关系。适用于需要判断不同版本软件更新顺序的场景。

Compare Version Numbers

const int len1 = version1.length();
        const int len2 = version2.length();
        int i = 0, j = 0;
        while(i < len1 || j < len2){
            int v1 = 0, v2 = 0;
            if(i < len1){
                while(i < len1 && version1[i]!='.'){
                    v1 *= 10;
                    v1 += version1[i] - '0';
                    i++;
                }
            }
            if(j < len2){
                while(j < len2 && version2[j]!='.'){
                    v2 *= 10;
                    v2 += version2[j] - '0';
                    j++;
                }
            }
            if(v1 < v2) return -1;
            if(v1 > v2) return 1;
            i++; j++;
        }
        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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