题目：

题解：

typedef struct {
    int* num;
    int* src;
    int numsize;
} Solution;

Solution *obj = NULL;

Solution* solutionCreate(int* nums, int numsSize) {
    if (obj != NULL) {
        return obj;
    }
    Solution *obj = (Solution*)malloc(sizeof(Solution));
    obj->numsize = numsSize;
    //obj->num = (int*)malloc(sizeof(int) * numsSize);
    obj->num = nums;
    obj->src = (int*)malloc(sizeof(int) * numsSize);
    for (int i = 0; i < obj->numsize; i++) 
    {
        // obj->num[i] = nums[i];
        obj->src[i] = nums[i];
    }
    return obj;
} 

int* solutionReset(Solution* obj, int* retSize) {

    *retSize = obj->numsize;
    return obj->num;
    /*
    int *ans = (int*) malloc(sizeof(int) * obj->numsize);
    for (int i = 0; i < obj->numsize; i++) {
        ans[i] = obj->num[i];
    }
    return ans;
    */
}

int* solutionShuffle(Solution* obj, int* retSize) {
    *retSize = obj->numsize;
    /*
    int *ans = (int*) malloc(sizeof(int) * obj->numsize);
    for (int i = 0; i < obj->numsize; i++) {
        ans[i] = obj->num[i];
    }
    */
    for (int i = 0; i < obj->numsize; i++) {
        int k = (rand() % obj->numsize);
        int temp = obj->src[k];
        obj->src[k] = obj->src[i];
        obj->src[i] = temp;
    }
    return obj->src;
}

void solutionFree(Solution* obj) {
    free(obj->num);
    free(obj->src);
    free(obj);
    obj = NULL;
}

/**
 * Your Solution struct will be instantiated and called as such:
 * Solution* obj = solutionCreate(nums, numsSize);
 * int* param_1 = solutionReset(obj, retSize);
 
 * int* param_2 = solutionShuffle(obj, retSize);
 
 * solutionFree(obj);
*/