C++读取txt的随机行？

#include <iostream>
#include <fstream>
#include <string>
#include <cstdlib>
#include <ctime>

using namespace std;

string getRandomLine(const string& filename) {
    ifstream file(filename);
    if (!file.is_open()) {
        cout << "Failed to open file." << endl;
        return "";
    }

    int lineCount = 0;
    string line;
    while (getline(file, line)) {
        lineCount++;
    }

    srand(time(0));
    int randomLine = rand() % lineCount + 1;

    file.clear();
    file.seekg(0, ios::beg);

    int currentLine = 1;
    while (getline(file, line)) {
        if (currentLine == randomLine) {
            file.close();
            return line;
        }
        currentLine++;
    }

    file.close();
    return "";
}

int main() {
    string filename = "example.txt";
    string randomLine = getRandomLine(filename);
    if (randomLine.empty()) {
        cout << "Failed to get random line." << endl;
    } else {
        cout << "Random line: " << randomLine << endl;
    }

    return 0;
}