Swift二维数组：获取值为0且索引最小的元素求助

Hey Jonas, sorry your code isn't working out—let's get this sorted for you!

First off, let's make sure we're on the same page: you want to find the first occurrence of 0 in your 2D array (the one with the smallest indices, checking row by row left to right, then top to bottom). That makes sense!

Quick Example to Set the Scene #

Say your 2D array looks like this:

my_2d_array = [
    [1, 4, 7],
    [2, 0, 8],
    [3, 5, 0]
]

The first 0 here is at index (1, 1) (if we're using 0-based counting) — that's the one we want to grab.

Why Your Code Might Be Failing #

Even though you didn't share your code, the most common issues here are:

• Not stopping the search as soon as you find the first 0 (so you end up grabbing a later one instead)
• Traversing the array in the wrong order (like column-first instead of row-first) which would skip the smallest-indexed 0

Working Solutions (Python Example) #

Here are two straightforward ways to get what you need, depending on whether you want the element's indices or the element itself:

1. Get the Indices of the First 0

def find_first_zero_indices(arr):
    for row_num, row in enumerate(arr):
        for col_num, value in enumerate(row):
            if value == 0:
                return (row_num, col_num)
    # If no 0 exists in the array, return a default value (adjust as needed)
    return None

# Test it out
my_2d_array = [[1,4,7],[2,0,8],[3,5,0]]
print(find_first_zero_indices(my_2d_array))  # Output: (1, 1)

2. Get the First 0 Element Directly

def get_first_zero_element(arr):
    for row in arr:
        for value in row:
            if value == 0:
                return value
    # No 0 found? Return a default
    return None

print(get_first_zero_element(my_2d_array))  # Output: 0

How This Works #

• We loop through the array row by row, left to right — this ensures we check elements in order of their index size
• As soon as we hit a 0, we immediately return it (or its indices) — this stops the search right away, so we don't waste time checking later elements
• If there's no 0 in the array, we return None — you can swap this out for something else (like -1) if that fits your use case better

If you're working with a different language (like JavaScript, Java, etc.), just let me know and I can tweak this solution to match!

内容的提问来源于stack exchange，提问作者user9469498