165 Compare Version Numbers

本文介绍了一种用于比较软件版本号的C++实现方法。通过逐个解析版本号字符串中的数字部分,并忽略前导零,来精确地比较两个版本号之间的大小。此方法适用于多种应用场景,如软件更新检查等。

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方法一:(每一个”."的子段比较所代表的数字,其中去除前导零)
class Solution {
public:
    int compareVersion(string version1, string version2) {
        int i=0,j=0;
        while(true){
            int n1=0, n2=0;
            while(version1[i]=='0'&&i<version1.length())
                i++;
            while(version1[i]!='.'&&i<version1.length()){
                n1=n1*10+version1[i]-'0';
                i++;
            }
            
            while(version2[j]=='0'&&j<version2.length())
                j++;
            while(version2[j]!='.'&&j<version2.length()){
                n2=n2*10+version2[j]-'0';
                j++;
            }
            
            if(n1>n2)
                return 1;
            else if(n1<n2)
                return -1;
            else if(i==version1.length()&&j==version2.length())
                return 0;
            
            if(version1[i]=='.'&&i<version1.length())
                i++;
            if(version2[j]=='.'&&j<version2.length())
                j++;
            
        }
    }
};

### 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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