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Hi. As for why we subtract k, I just added a detailed example to help answer your question in my original post.
Regarding the exact values of a and b, it's a little tricky since a and b are 1-indexed but our array is 0-indexed. So we want to subtract 1 from both a and b. However, for b we re-add 1 because we want to change values from a to binclusive as stated in the problem, so we want the end of the interval to be 1 to the right of b which is why we re-add the 1.
Array Manipulation
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Hi. As for why we subtract k, I just added a detailed example to help answer your question in my original post.
Regarding the exact values of a and b, it's a little tricky since a and b are 1-indexed but our array is 0-indexed. So we want to subtract 1 from both a and b. However, for b we re-add 1 because we want to change values from a to b inclusive as stated in the problem, so we want the end of the interval to be 1 to the right of b which is why we re-add the 1.
Hope this helps.
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