ตัวจำแนกแบบ K เพื่อนบ้านที่ใกล้ที่สุด

อินพุต:
long long k = 3;
std::vector<double> query = {3.0, 3.0};
std::vector<std::string> labels = {"A", "A", "B", "B"};
std::vector<std::vector<double>> points = {
    {1.0, 1.0},
    {2.0, 2.0},
    {8.0, 8.0},
    {9.0, 9.0}
};

ผลลัพธ์ที่คาดหวัง:
std::string expected = "A";

อินพุต:
long k = 3;
double[] query = new double[] {3.0, 3.0};
string[] labels = new string[] {"A", "A", "B", "B"};
double[][] points = new double[][] {
    new double[] {1.0, 1.0},
    new double[] {2.0, 2.0},
    new double[] {8.0, 8.0},
    new double[] {9.0, 9.0}
};

ผลลัพธ์ที่คาดหวัง:
string expected = "A";

อินพุต:
long long k = 2;
std::vector<double> query = {1.0, 1.0};
std::vector<std::string> labels = {"red", "blue", "blue", "red"};
std::vector<std::vector<double>> points = {
    {0.0, 0.0},
    {4.0, 0.0},
    {0.0, 4.0},
    {4.0, 4.0}
};

ผลลัพธ์ที่คาดหวัง:
std::string expected = "red";

อินพุต:
long k = 2;
double[] query = new double[] {1.0, 1.0};
string[] labels = new string[] {"red", "blue", "blue", "red"};
double[][] points = new double[][] {
    new double[] {0.0, 0.0},
    new double[] {4.0, 0.0},
    new double[] {0.0, 4.0},
    new double[] {4.0, 4.0}
};

ผลลัพธ์ที่คาดหวัง:
string expected = "red";