编程刷题第一题就不会

leetcode新手村第一题
我想把它补全，然后修改着成了下面这副模样

#include
#include
int i,numsSize;
int nums[]={0};
int runningSum(int nums[], int numsSize) {
    for (i = 1; i < numsSize; i++) {
        nums[i] += nums[i - 1];
    }
    return nums[i];
}
int main()
{   printf("please input some size:");
    scanf_s("%d", &numsSize);
    printf("please input some numbers:\n");
    for (i = 1; i < numsSize; i++)
    {
        scanf_s("%d ", &nums[i]);
    }
    runningSum(nums[i], numsSize);
    printf("%d", nums[i]);
    system("pause");
    return 0;
}

读取位置时发生冲突，且无法输出结果

输入：nums = [1,2,3,4]
输出：[1,3,6,10]
解释：动态和计算过程为 [1, 1+2, 1+2+3, 1+2+3+4] 。

/**
 * Note: The returned array must be malloced, assume caller calls free().
 */
int* twoSum(int* nums, int numsSize, int target, int* returnSize){
    int i,j = 0;
    int* Result = NULL; 
    for(i = 0;i < numsSize - 1;i++)
    {
        for(j = i + 1;j < numsSize;j++)
        {
            if(nums[i] + nums[j] == target)
            {
                Result = (int*)malloc(sizeof(int)*2);
                Result[0] = i;
                Result[1] = j;
                *returnSize = 2;
                return Result;
            }
        }
    }
    *returnSize = 0;
    return Result;
}