Count the integers in a given vector v.
You must use a loop to count each element separately.
Input: v = [1.6, 5.7, 8, -3, 5.3, 9.0, -1, 0, 12]
Output: n = 6 (9.0 is also an integer)
Input: v = [1.2, 2.3, 4.5]
Output: n = 0
Replace NaNs with the number that appears to its left in the row.
2倍してみよう - ここからスタート！
Find the starting index of a consecutive condition
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Triangle of numbers
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