In C/C++, how should I read/write long longs?

How can i write long longs in C/C++?

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Some compilers, such as Dev-C++, require you to use %I64d with scanf/printf. However, for your code to work on Codechef, use %lld instead.

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Or simply use cout.

Along with the line std::ios_base::sync_with_stdio(false); at the beginning of main to speed up cout/cin

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