First of all, when you want help for a challenge from a challenge site, it is a good idea to post a link yo original page. Because every word matters.
Your questions here says: 1<=N<=M<=2∗
But on stackoverflow, it says: 1<=N<=M<=2∗109
Which one is correct or both wrong ?
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i have tried a code given below but it does not pass test cases
The sample test in question is OK, show test that fail.
Do not expect any of us experimenting until we find a failing input, it is a real job.
Without more details, the only way to go is using the debugger with failing input to see when it go wrong.
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How do I develop different logic for the code given below
Compare your own logic with a sheet of paper and a pencil with the logic of your code. You may get a surprise.
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Your code do not behave the way you expect, or you don't understand why !
There is an almost universal solution: Run your code on debugger step by step, inspect variables.
The debugger is here to show you what your code is doing and your task is to compare with what it should do.
There is no magic in the debugger, it don't know what your code is supposed to do, it don't find bugs, it just help you to by showing you what is going on. When the code don't do what is expected, you are close to a bug.
To see what your code is doing: Just set a breakpoint and see your code performing, the debugger allow you to execute lines 1 by 1 and to inspect variables as it execute.
Debugger - Wikipedia, the free encyclopedia[
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Mastering Debugging in Visual Studio 2010 - A Beginner's Guide[
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Basic Debugging with Visual Studio 2010 - YouTube[
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1.11 — Debugging your program (stepping and breakpoints) | Learn C++[
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The debugger is here to only show you what your code is doing and your task is to compare with what it should do.