leetcode2455: Average Value of Even Numbers That Are Divisible by Three

[carloscn]

Description

Given an integer array nums of positive integers, return the average value of all even integers that are divisible by 3.

Note that the average of n elements is the sum of the n elements divided by n and rounded down to the nearest integer.

Example 1:

Input: nums = [1,3,6,10,12,15] Output: 9 Explanation: 6 and 12 are even numbers that are divisible by 3. (6 + 12) / 2 = 9.

Example 2:

Input: nums = [1,2,4,7,10] Output: 0 Explanation: There is no single number that satisfies the requirement, so return 0.

Constraints:

1 <= nums.length <= 1000 1 <= nums[i] <= 1000

[carloscn]

Analysis

static int32_t average_value(int32_t *nums, size_t nums_size)
{
    int32_t ret = 0;

    UTILS_CHECK_PTR(nums);
    UTILS_CHECK_LEN(nums_size);

    int32_t count = 0;
    for (size_t i = 0; i < nums_size; i ++) {
        if ((nums[i] % 3) == 0) {
            ret += nums[i];
            count ++;
        }
    }

    if (count != 0) {
        ret /= count;
    }

finish:
    return ret;
}

[carloscn]

Code

https://review.gerrithub.io/c/carloscn/structstudy/+/1171192 https://github.com/carloscn/structstudy/commit/37af336e859faeff3f35f063a631fa447fecf456