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I have see many people #include<bits/stdc++.h> and use ios::sync_with_stdio(0); and cin.tie(0); I don't know what's that please help me ?

Phát Relax
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    Does this answer your question? [Significance of ios\_base::sync\_with\_stdio(false); cin.tie(NULL);](https://stackoverflow.com/questions/31162367/significance-of-ios-basesync-with-stdiofalse-cin-tienull) – jh316 Dec 25 '21 at 04:13
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    *I have see many people #include* -- Stop looking at that code. It is very poor code that is being submitted to an "online competition" coding website. [See this](https://stackoverflow.com/questions/31816095/why-should-i-not-include-bits-stdc-h) – PaulMcKenzie Dec 25 '21 at 04:21

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