參考資訊:
https://www.cnblogs.com/cnoodle/p/14375730.html
題目:

解答:
double findMaxAverage(int* nums, int numsSize, int k)
{
int i = 0;
int r = -INT_MAX;
int sum = 0;
for (i = 0; i < numsSize; i++) {
sum += nums[i];
if (i >= (k - 1)) {
if (sum > r) {
r = sum;
}
sum -= nums[i - (k - 1)];
}
}
return (double)r / k;
}