需要实现集合操作的C库

#include <stdio.h>
#include <stdlib.h>

typedef struct {
    int* elements;
    int size;
} Set;

Set* createSet(int size) {
    Set* set = (Set*)malloc(sizeof(Set));
    set->elements = (int*)malloc(size * sizeof(int));
    set->size = size;
    return set;
}

void destroySet(Set* set) {
    free(set->elements);
    free(set);
}

void addElement(Set* set, int element) {
    // 检查元素是否已存在
    for (int i = 0; i < set->size; i++) {
        if (set->elements[i] == element) {
            return;
        }
    }
    // 添加元素
    for (int i = 0; i < set->size; i++) {
        if (set->elements[i] == 0) {
            set->elements[i] = element;
            return;
        }
    }
}

void removeElement(Set* set, int element) {
    for (int i = 0; i < set->size; i++) {
        if (set->elements[i] == element) {
            set->elements[i] = 0;
            return;
        }
    }
}

Set* unionSet(Set* set1, Set* set2) {
    Set* resultSet = createSet(set1->size + set2->size);
    for (int i = 0; i < set1->size; i++) {
        addElement(resultSet, set1->elements[i]);
    }
    for (int i = 0; i < set2->size; i++) {
        addElement(resultSet, set2->elements[i]);
    }
    return resultSet;
}

Set* intersectSet(Set* set1, Set* set2) {
    Set* resultSet = createSet(set1->size);
    for (int i = 0; i < set1->size; i++) {
        for (int j = 0; j < set2->size; j++) {
            if (set1->elements[i] == set2->elements[j]) {
                addElement(resultSet, set1->elements[i]);
                break;
            }
        }
    }
    return resultSet;
}

// 其他集合操作函数...

int main() {
    Set* set1 = createSet(5);
    addElement(set1, 1);
    addElement(set1, 2);
    addElement(set1, 3);

    Set* set2 = createSet(5);
    addElement(set2, 3);
    addElement(set2, 4);
    addElement(set2, 5);

    Set* resultSet = unionSet(set1, set2);
    printf("Union: ");
    for (int i = 0; i < resultSet->size; i++) {
        if (resultSet->elements[i] != 0) {
            printf("%d ", resultSet->elements[i]);
        }
    }
    printf("\n");

    destroySet(set1);
    destroySet(set2);
    destroySet(resultSet);

    return 0;
}