for (int i = 0; i < NUM_TRAINING_SAMPLES; i++)
        distances[i] =
                sqrt((trainingSamples[i][0] - testSample[0]) * (trainingSamples[i][0] - sample[0]) +
                     (trainingSamples[i][1] - testSample[1]) * (trainingSamples[i][1] - testSample[1]) +
                     (trainingSamples[i][2] - testSample[2]) * (trainingSamples[i][2] - testSample[2]) +
                     (trainingSamples[i][3] - testSample[3]) * (trainingSamples[i][2]- testSample[3]));