【leetcode】1389. 按既定顺序创建目标数组

/**
 * Note: The returned array must be malloced, assume caller calls free().
 */
int* createTargetArray(int* nums, int numsSize, int* index, int indexSize, int* returnSize){
    int* arr=(int*)calloc(numsSize,sizeof(int));
    int i, j;
    for(i=0; i<indexSize; i++){
        if(index[i] < i)
            for(j=i; j>index[i]; j--)
                arr[j]=arr[j-1];    
                 
        arr[index[i]]=nums[i];        
    }
    *returnSize=numsSize;
    return arr;
}