如何解决C++大数据开发中的数据去重策略问题?

#include <iostream>
#include <unordered_set>

int main() {
    std::unordered_set<int> uniqueData;
    int data[] = {1, 2, 3, 4, 5, 4, 3, 2, 1};

    int dataSize = sizeof(data) / sizeof(int);
    for (int i = 0; i < dataSize; i++) {
        uniqueData.insert(data[i]);
    }

    for (auto it = uniqueData.begin(); it != uniqueData.end(); ++it) {
        std::cout << *it << " ";
    }
    std::cout << std::endl;

    return 0;
}

#include <iostream>

struct TreeNode {
    int val;
    TreeNode* left;
    TreeNode* right;

    TreeNode(int x) : val(x), left(nullptr), right(nullptr) {}
};

void insert(TreeNode*& root, int val) {
    if (root == nullptr) {
        root = new TreeNode(val);
    } else if (val < root->val) {
        insert(root->left, val);
    } else if (val > root->val) {
        insert(root->right, val);
    }
}

void print(TreeNode* root) {
    if (root == nullptr) {
        return;
    }
    print(root->left);
    std::cout << root->val << " ";
    print(root->right);
}

int main() {
    TreeNode* root = nullptr;
    int data[] = {1, 2, 3, 4, 5, 4, 3, 2, 1};

    int dataSize = sizeof(data) / sizeof(int);
    for (int i = 0; i < dataSize; i++) {
        insert(root, data[i]);
    }

    print(root);
    std::cout << std::endl;

    return 0;
}

#include <iostream>
#include <cstring>

const int MAX_VALUE = 1000000;

void deduplicate(int data[], int dataSize) {
    bool bitmap[MAX_VALUE];
    std::memset(bitmap, false, sizeof(bitmap));

    for (int i = 0; i < dataSize; i++) {
        if (!bitmap[data[i]]) {
            bitmap[data[i]] = true;
        }
    }

    for (int i = 0; i < MAX_VALUE; i++) {
        if (bitmap[i]) {
            std::cout << i << " ";
        }
    }
    std::cout << std::endl;
}

int main() {
    int data[] = {1, 2, 3, 4, 5, 4, 3, 2, 1};
    int dataSize = sizeof(data) / sizeof(int);

    deduplicate(data, dataSize);

    return 0;
}