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Helper method for what ? Helpers are used typically to break down the code logic into simpler blocks. What matters on leetcode is correctness and performance.
This is a really helpful way to explain it. Thank you for this.
Assuming op is studying for an interview, raw performance isn't everything. In addition, we also look for code that's scalable and maintainable. Part of that is being readable. In breaking large blocks of code into smaller translation units makes it easier to debug, and to test.
Dm me
stop focusing on if a helper function was used or not. Understand the logic first (before you write any code) and all those ways of breaking down the code will come intuitively. The key here is the problem solving piece