将enum ObjectType { UNKNOWN = 0, UNKNOWN_MOVABLE = 1, UNKNOWN_UNMOVABLE = 2, PEDESTRIAN = 3, BICYCLE = 4, VEHICLE = 5, MAX_OBJECT_TYPE = 6, };制作为二维表并读取x，y

可以将ObjectType看作是一维表的列名，然后将每个对象类型作为一维表的行，构成一个二维表。可以使用如下代码实现：

#include <iostream>
#include <string>

enum ObjectType {
    UNKNOWN = 0,
    UNKNOWN_MOVABLE = 1,
    UNKNOWN_UNMOVABLE = 2,
    PEDESTRIAN = 3,
    BICYCLE = 4,
    VEHICLE = 5,
    MAX_OBJECT_TYPE = 6,
};

std::string ObjectTypeToString(ObjectType type) {
    switch (type) {
        case UNKNOWN:
            return "UNKNOWN";
        case UNKNOWN_MOVABLE:
            return "UNKNOWN_MOVABLE";
        case UNKNOWN_UNMOVABLE:
            return "UNKNOWN_UNMOVABLE";
        case PEDESTRIAN:
            return "PEDESTRIAN";
        case BICYCLE:
            return "BICYCLE";
        case VEHICLE:
            return "VEHICLE";
        default:
            return "UNKNOWN";
    }
}

int main() {
    // 构建二维表
    const int ROWS = ObjectType::MAX_OBJECT_TYPE;
    const int COLS = 2;
    std::string table[ROWS][COLS];
    for (int i = 0; i < ROWS; ++i) {
        ObjectType type = static_cast<ObjectType>(i);
        table[i][0] = ObjectTypeToString(type);
        table[i][1] = std::to_string(type);
    }

    // 读取二维表的值
    int x, y;
    std::cout << "请输入x和y的值：" << std::endl;
    std::cin >> x >> y;
    if (x >= 0 && x < ROWS && y >= 0 && y < COLS) {
        std::cout << "table[" << x << "][" << y << "] = " << table[x][y] << std::endl;
    } else {
        std::cout << "输入的x或y值不合法！" << std::endl;
    }

    return 0;
}

以上代码中，`table`数组是二维表，其中每一行表示一个对象类型，第一列是对象类型的字符串表示，第二列是对象类型的整数值。

`ObjectTypeToString`函数是将对象类型转换为字符串的辅助函数。

在`main`函数中，首先构建二维表，然后读取用户输入的x和y值，如果输入的值合法，则输出对应的二维表中的值。