[1480] Running Sum of 1d Array

什麼原來可以蓋掉原本的array直接回傳就好了嗎！

/**

 * Note: The returned array must be malloced, assume caller calls free().

 */

int* runningSum(int* nums, int numsSize, int* returnSize){

    int runSum=0;

    int* returnArray = malloc(sizeof(int)*numsSize);

    *returnSize = numsSize;

    for(int i=0;i<numsSize; i++)

    {

        runSum+=nums[i];

        returnArray[i]=runSum;

    }

    

    return returnArray;

}

精簡以後變這樣 ： 

/**

 * Note: The returned array must be malloced, assume caller calls free().

 */

int* runningSum(int* nums, int numsSize, int* returnSize){

    *returnSize = numsSize;

    for(int i=1;i<numsSize; i++)

        nums[i]=nums[i-1]+nums[i];

    

    return nums;

}

但是速度反而變慢了是怎麼回事XD~ 奇怪OrzL