redundant & necessary changes #4
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1. In C++ `using` is suggest because it is type safe and for easy debugging. 2. `<bits/stdc++.h>` contains everything which makes below header files to be removed by header guards. 3. Not sure why you did `#define f first`, it can ruin code if there is a variable named f which is common. You can replace with `ff` or something like `F`
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usingis suggest because it is type safe and for easy debugging.<bits/stdc++.h>contains everything which makes below header files to be removed by header guards.#define f first, it can ruin code if there is a variable named f which is common. You can replace withffor something likeF