计算两数之和

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