int cmp(void *e1,void *e2)
{
    return *(int*)e2>*(int*)e1;
}

int thirdMax(int* nums, int numsSize){
    qsort(nums,numsSize,sizeof(nums[0]),cmp);
     for (int i = 1, diff = 1; i < numsSize; ++i) {
            if (nums[i] != nums[i - 1] && ++diff == 3) { 
                return nums[i];
            }
        }
        return nums[0];
}