#include <iostream>  // for input/output
#include <cmath>     // for pow (used in geometric mean)
#include <vector>

using namespace std;
void computeMeans(int a, int b, int c, double &arith, double &geom, double &harm) { //doesn't return anything
    arith = (a + b + c) / 3.0;
    geom = pow(a * b * c, 1.0 / 3.0);
    harm = 3.0 / ( (1.0 / a) + (1.0 / b) + (1.0 / c) );
}
void computeMeansVector(const vector<int> &v, double &arith, double &geom, double &harm) {
    int n = v.size();  // number of elements in the vector
    // If the vector is empty, avoid division by zero
    if (n == 0) {
        arith = geom = harm = 0.0;
        return;
    }
    double sum = 0.0;
    double product = 1.0;
    double reciprocalSum = 0.0;

    for (int i = 0; i < n; ++i) {
        sum += v[i];
        product *= v[i];
        reciprocalSum += 1.0 / v[i];
    }

    arith = sum / n;
    geom = pow(product, 1.0 / n);
    harm = n / reciprocalSum;
}

int main() {
    int x, y, z;
    double am, gm, hm; // to store the results
    double amV, gmV, hmV; // to store the results vector case
    vector<int> values;

    // Example input 1
    x = 1; y = 4; z = 16;
    computeMeans(x, y, z, am, gm, hm);
    cout << "Input: (1, 4, 16)" << endl;
    cout << "Arithmetic mean: " << am << endl;
    cout << "Geometric mean:  " << gm << endl;
    cout << "Harmonic mean:   " << hm << endl << endl;

    values = {1, 4, 16};
    computeMeansVector(values, amV, gmV, hmV);
    cout << "Input: (1, 4, 16)" << endl;
    cout << "Arithmetic mean: " << amV << endl;
    cout << "Geometric mean:  " << gmV << endl;
    cout << "Harmonic mean:   " << hmV << endl << endl;

    // Example input 2
    x = 2; y = 3; z = 5;
    computeMeans(x, y, z, am, gm, hm);
    cout << "Input: (2, 3, 5)" << endl;
    cout << "Arithmetic mean: " << am << endl;
    cout << "Geometric mean:  " << gm << endl;
    cout << "Harmonic mean:   " << hm << endl << endl;

    values = {2, 3, 5};
    computeMeansVector(values, amV, gmV, hmV);
    cout << "Input: (2, 3, 5)" << endl;
    cout << "Arithmetic mean: " << amV << endl;
    cout << "Geometric mean:  " << gmV << endl;
    cout << "Harmonic mean:   " << hmV << endl << endl;

    // Example input 3
    x = 1000; y = 4000; z = 16000;
    computeMeans(x, y, z, am, gm, hm);
    cout << "Input: (1000, 4000, 16000)" << endl;
    cout << "Arithmetic mean: " << am << endl;
    cout << "Geometric mean:  " << gm << endl;
    cout << "Harmonic mean:   " << hm << endl << endl;

    values = {1000, 4000, 16000};
    computeMeansVector(values, amV, gmV, hmV);
    cout << "Input: (1000, 4000, 16000)" << endl;
    cout << "Arithmetic mean: " << amV << endl;
    cout << "Geometric mean:  " << gmV << endl;
    cout << "Harmonic mean:   " << hmV << endl << endl;

    return 0;
}