appliWall, C++ (clang)

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#include <iostream>
#include <string>
#include <sstream>
#include <vector>
#include <random>

using namespace std;

ostream& operator<<(ostream &str, const vector<int> & vect)
{
    str << "\"";
    for(int i = 0; i < vect.size()-1; ++i) {
        str << vect[i] << ",";
    }
    str << vect.back() << "\"" << endl;
	return str;
}

// For each element , pick a random element to the left and swap them
void myShuffle(vector<int> & appsVect) 
{
    random_device randDev;
    mt19937 engine{randDev()};   // mt19937 is a standard mersenne_twister_engine
    for (int i = 1; i < appsVect.size(); ++i) {
        uniform_int_distribution<int> dist(0, i-1);
        swap(appsVect[i], appsVect[dist(engine)]);
    }   
}

int main()
{
    string strIn;
    getline(cin, strIn);
    // remove the " if there are here
    if (strIn[0] == '\"') {
        strIn = strIn.substr(1, strIn.size()-2);
    }
    stringstream ss;
    ss << strIn;
    vector<int> appsVect;
    while (getline( ss, strIn, ',' )) {
        appsVect.push_back(stoi(strIn));
    }

int n = appsVect.size();
    if (n == 0) {
        cout << "No elements to shuffle" << endl;
        return 1;
    } else if (n == 1) {
        cout << appsVect[0];
    } else {
        myShuffle(appsVect);
        cout << appsVect;
    }    
    return 0;
}

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Compilation time: 2.45 sec, absolute running time: 0.63 sec, cpu time: 0.54 sec, memory peak: 4 Mb, absolute service time: 3,09 sec