两数求和的主函数，写不出来

Question

int* twoSum(int* nums, int numsSize, int target, int* returnSize){
    int i = 0;
    int j = 0;
    int *a=(int*)malloc(sizeof(int)*2);
    for( i=0;i<numsSize-1;i++)
    {
        for( j=i+1;j<numsSize;j++)
        {
            if(nums[i]+nums[j]==target)
            {
                a[0]=i;
                a[1]=j;
                * returnSize = 2;
                return a;
            }
        }
    }
    
    return a;
}

主函数写半天，写不出来，希望指点一下

Answer 1

int main()
{
int nums[] = {2,7,11,15};
int target = 9;
int returnSize;
int * r = twoSum(nums, 4, targett, &returnSize);
for (int i = 0; i < returnSize; i++) printf("%d ", r[i]);
return 0;
}